Network Extension

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Customize and extend the core networking features of iOS, iPad OS, and macOS using Network Extension.

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NEHotspotNetwork headaches
I'm trying to use NEHotspotNetwork to configure an IoT. I've read all the issues that have plagued other developers when using this framework, and I was under the impression that bugs were filed and fixed. Here are my issues in hopes that someone can catch my bug, or has finally figured this out and it's not a bug in the framework with no immediate fix on the horizon. If I use the following code: let config = NEHotspotConfiguration(ssid: ssid) config.joinOnce = true KiniStatusBanner.shared.show(text: "Connecting to Kini", in: presentingVC.view) NEHotspotConfigurationManager.shared.apply(config) { error in DispatchQueue.main.async { if let nsError = error as NSError?, nsError.domain == NEHotspotConfigurationErrorDomain, nsError.code == NEHotspotConfigurationError.alreadyAssociated.rawValue { print("Already connected to \(self.ssid)") KiniStatusBanner.shared.dismiss() self.presentCaptivePortal(from: presentingVC, activationCode: activationCode) } else if let error = error { // This doesn't happen print("❌ Failed to connect: \(error.localizedDescription)") KiniStatusBanner.shared.update(text: "Failed to Connect to Kini. Try again later.") KiniStatusBanner.shared.dismiss(after: 2.5) } else { // !!!! Most often, this is the path the code takes NEHotspotNetwork.fetchCurrent { current in if let ssid = current?.ssid, ssid == self.ssid { log("✅✅ 1st attempt: connected to \(self.ssid)") KiniStatusBanner.shared.dismiss() self.presentCaptivePortal(from: presentingVC, activationCode: activationCode) } else { // Dev forums talked about giving things a bit of time to settle and then try again DispatchQueue.main.asyncAfter(deadline: .now() + 2) { NEHotspotNetwork.fetchCurrent { current in if let ssid = current?.ssid, ssid == self.ssid { log("✅✅✅ 2nd attempt: connected to \(self.ssid)") KiniStatusBanner.shared.dismiss() self.presentCaptivePortal(from: presentingVC, activationCode: activationCode) } else { log("❌❌❌ 2nd attempt: Failed to connect: \(self.ssid)") KiniStatusBanner.shared.update(text: "Could not join Kini network. Try again.") KiniStatusBanner.shared.dismiss(after: 2.5) self.cleanupHotspot() DispatchQueue.main.asyncAfter(deadline: .now() + 2) { print("cleanup again") self.cleanupHotspot() } } } } log("❌❌ 1st attempt: Failed to connect: \(self.ssid)") KiniStatusBanner.shared.update(text: "Could not join Kini network. Try again.") KiniStatusBanner.shared.dismiss(after: 2.5) self.cleanupHotspot() } As you can see, one can't just use NEHotspotConfigurationManager.shared.apply and has to double-check to make sure that it actually succeeds, by checking to see if the SSID desired, matches the one that the device is using. Ok, but about 50% of the time, the call to NEHotspotNetwork.fetchCurrent gives me this error: NEHotspotNetwork nehelper sent invalid result code [1] for Wi-Fi information request Well, there is a workaround for that randomness too. At some point before calling this code, one can: let locationManager = CLLocationManager() locationManager.requestWhenInUseAuthorization() That eliminates the NEHotspotNetwork nehelper sent invalid result code [1] for Wi-Fi information request BUT... three issues. The user is presented with an authorization alert: Allow "Kini" to use your location? This app needs access to you Wi-Fi name to connect to your Kini device. Along with a map with a location pin on it. This gives my users a completely wrong impression, especially for a device/app where we promise users not to track their location. They actually see a map with their location pinned on it, implying something that would freak out anyone who was expecting no tracking. I understand why an authorization is normally required, but since all we are getting is our own IoT's SSID, there should be no need for an authorization for this, and no map associated with the request. Again, they are accessing my IoT's network, NOT their home/location Wi-Fi SSID. My app already knows and specifies that network, and all I am trying to do is to work around a bug that makes it look like I have a successful return from NEHotspotConfigurationManager.shared.apply() when in fact the network I was looking for wasn't even on. Not only do I get instances where the network doesn't connect, and result codes show no errors, but I also get instances where I get an alert that says that the network is unreachable, yet my IoT shows that the app is connected to its Wi-Fi. On the iOS device, I go to the Wi-Fi settings, and see that I am on the IoT's network. So basically, sometimes I connect, but the frameworks says that there is no connection, and sometimes it reports a connection when there is none. As you can see in the code, I call cleanupHotspot() to make the iOS device get off of my temp Wi-Fi SSID. This is the code: func cleanupHotspot() { NEHotspotConfigurationManager.shared.removeConfiguration(forSSID: ssid) } That code gets called by the above code when things aren't as I expect and need to cleanup. And I also call it when the user dismisses the viewcontroller that is attempting to make the connection. It doesn't always work. I get stuck on the tempo SSID, unless I go through this whole thing again: try to make the connection again, this time it succeeds quickly, and then I can disconnect. Any ideas? I'm on iOS18.5, and have tried this on multiple iPhones including 11, 13 and 16.
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226
Nov ’25
Content filter installed but not running
We have a content filter system extension as part of our macOS app. The filter normally works correctly, activation and deactivation works as expected but occasionally we see an issue when the content filter is activated. When this issues occurs, the filter activation appears to behave correctly, no errors are reported. Using "systemextensionsctl list" we see the filter is labelled as "[activated enabled]". However, the installed content filter executable does not run. We have seen this issue on macOS 15.3 and later and on the beta macOS 26.1 RC. It happens only occasionally but when it does there is no indication as to why the executable is not running. There are no crash logs or errors in launchd logs. Both rebooting and deactivating/activating the filter do not resolve the issue. The only fix appears to be completely uninstalling the app (including content filter) and reinstalling. I have raised a FB ticket, FB20866080. Does anyone have any idea what could cause this?
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137
Oct ’25
Routing Packets.
I am new to iOS development and boldly decided to work on a project using the Network Extension with the goals of intercepting all incoming packets (not exclusive to my app), creating temporary copies, passing through the original unmodified packet, and then processing the copy. I currently have a Packet Tunnel that intercepts all IPv4 packets, but I do not know how to route them. The goal is to keep everything on the device for privacy concerns. So I have a few questions in mind: Is a packet tunnel necessary? I am reading into the Content Filter, but I am unsure if I can use it due to Apple's own apps possibly bypassing it. Is it possible to route packets collected from the tunnel? I thought about using NE Relays, but to my knowledge I cannot use the packets I obtained to do this. Are there any references to existing implementations I can look through? Are there any other unforeseen issues I might encounter while developing this? I can provide more information about the project I am working on if necessary. Any advice, references or sample code will be appreciated. Thanks in advance!
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126
Oct ’25
URL filter app with multiple configurations
Hello, We've been working on an app that uses the new NEUrlFilter API and we've got a question. Currently, the system is designed with the assumption that a single app == usecase == single remote database. But what if we would like to give the user the ability to use different blocklists? For example, the user may want to: Block scam domains Block tracking domains Block adult domains Or any composition of these 3 What should we do to give the user this option? It seems that we could differentiate different databases by using different PIR service hostnames, but that would also mean that we'll have to send several requests for the same usecase but with different PIR service hostnames (and they'll all share the same app bundle ID). Will these requests be accepted then? If not, is there an alternative? PS: By sending a request I mean submitting this form
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1
173
Oct ’25
Upgrading NEFilterDataProvider Causes System Network Interruption
Hi, when I perform an overlay installation via a PKG on macOS for an application containing the NEFilterDataProvider functionality, there is a chance that the entire system network becomes unreachable. Disabling the corresponding Content Filter in "System Settings > Network > Filters" immediately restores network connectivity. This issue does not occur every time, with a frequency of approximately 1 in 20 installation attempts.  The following details may help identify the problem: The Filter.app containing the NEFilterDataProvider resides within the main app's Resources directory, e.g., /Applications/Main.app/Contents/Resources/Filter.app Main.app is installed via a PKG; the issue typically occurs during an overlay installation of Main.app. The NEFilterDataProvider operates as a System Extension. The func handleNewFlow(_ flow: NEFilterFlow) -> NEFilterNewFlowVerdict {} returns .allow. Wireshark packet captures show TCP packets but no UDP packets; TCP handshakes cannot complete. Disabling the corresponding content filter in "System Settings > Network > Filters" restores the network; re-enabling it breaks connectivity again. After waiting for a period, approximately 30-60 minutes, network connectivity can recover automatically. What causes this and how can it be fixed? Any workarounds?
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186
Oct ’25
SystemExtension approve failed on mac15.x
Hello, I'm an application developer related to Apple system extensions. I developed an endpoint security system extension that can run normally before the 14.x system. However, after I upgraded to 15.x, I found that when I uninstalled and reinstalled my system extension, although the system extension was installed successfully, a system warning box would pop up when I clicked enable in the Settings, indicating a failure. I conducted the following test. I reinstalled a brand-new MAC 15.x system. When I installed my applications, the system extensions could be installed successfully and enabled normally. However, when I uninstalled and reinstalled, my system extension couldn't be enabled properly and a system warning popped up as well. I tried disabling SIP and enabling System Extension Developers, but it still didn't work. When the system warning box pops up, I can see some error log information through the console application, including an error related to Failed to authorize right 'com.apple.system-extensions.admin' by client '/System/Library/ExtensionKit/Extensions/SettingsSystemExtensionController.appex' [2256] for authorization created by '/System/Library/ExtensionKit/Extensions/SettingsSystemExtensionController.appex' [2256] (3,0) (-60005) (engine 179) as shown in the screenshot. The same problem, mentioned in Cannot approve some extensions in MacOS Sequoia , but there is no solution
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872
Oct ’25
The network connection fails with NEFilterDataProvider and QQMusic running at the same time
The environment: macOS 12.0 ~ 15.6 A NetworkExtension NEFilterDataProvider configured with filterSockets = YES, filterPackets = NO, and it doesn't actually block any network connection. QQMusic (download: https://y.qq.com/n/ryqq/download_detail/mac?ADTAG=YQQ) is constantly playing. Any of the following operations can reproduce the issue: Kill the NetworkExtension process and then restarted by the system. Disable the NEFilterDataProvider, and then enable it. When this problem occurs, there are two different phenomena on the NetworkExtension process: It is zombie, or is in high CPU state (100%). When the NetworkExtension process is zombie, obviously, the new network connections will enter it, and they can't be disposed by the old zombie process, so the network is disconnected. Spindump-qqmusic-ne-zombie When the NetworkExtension process is in high CPU state, its thread DispatchQueue "NEFilterExtensionProviderContext queue" is blocked in the kernel when calling close. Spindump-qqmusic-ne-cpuhigh In most cases, the network will recover after stopping QQ Music, that is the suspended zombie NetworkExtension process will exist or the cpu of it return to normal. To reproduce the issue in a simple environment, I have tried many ways to simulate the network behavior of QQMusic, but all failed. It seems that this issue is caused by UDP traffic of QQMusic, because everything is ok after blocking the UDP connections of QQMusic (the music is still playing at this time) in the NEFilterDataProvider.
2
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259
Oct ’25
VPN Stuck at connecting
Hello, I’ve run into some strange behavior with the macOS System Extension using a Packet Tunnel. The issue showed up after the device went to sleep while the VPN was running. When I woke the computer, the VPN tried to reconnect but never succeeded — it just stayed stuck in the “connecting” state. I was able to turn the VPN off, but every attempt to turn it back on failed and got stuck at “connecting” again. Even removing the VPN configuration from Settings didn’t help. The only thing that worked was disabling the system extension completely. While checking the logs, I noticed thousands of identical log messages appearing within just a few seconds: nesessionmanager(562) deny(1) system-fsctl (_IO "h" 47) 17:11:52.481498+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5454 com.apple.networkextension 17:11:52.481568+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5454 com.apple.networkextension 17:11:52.481580+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5454 com.apple.networkextension 17:11:52.481587+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5454 com.apple.networkextension 17:11:52.481646+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5446 com.apple.networkextension 17:11:52.481664+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5446 com.apple.networkextension 17:11:52.481671+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5446 com.apple.networkextension 17:11:52.481676+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5446 com.apple.networkextension 17:11:52.481682+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5446 com.apple.networkextension 17:11:52.481687+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5446 com.apple.networkextension After the burst of these repeated messages, I started seeing logs like the following: 17:11:52.481759+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Spotify Helper[69038] com.apple.networkextension 17:11:52.481790+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Spotify Helper[69038]: session in state connecting com.apple.networkextension 17:11:52.481949+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Spotify Helper[69038] com.apple.networkextension 17:11:52.481966+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Spotify Helper[69038]: session in state connecting com.apple.networkextension 17:11:52.481986+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Spotify Helper[69038] com.apple.networkextension 17:11:52.481992+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Spotify Helper[69038]: session in state connecting com.apple.networkextension 17:11:52.482003+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Spotify Helper[69038] com.apple.networkextension 17:11:52.482011+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Spotify Helper[69038]: session in state connecting com.apple.networkextension 17:11:52.482022+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Spotify Helper[69038] com.apple.networkextension 17:11:52.482028+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Spotify Helper[69038]: session in state connecting com.apple.networkextension 17:11:52.482039+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Spotify Helper[69038] com.apple.networkextension 17:11:52.482049+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Spotify Helper[69038]: session in state connecting com.apple.networkextension 17:11:52.482060+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Slack Helper[84828] com.apple.networkextension 17:11:52.482069+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Slack Helper[84828]: session in state connecting com.apple.networkextension 17:11:52.482079+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from sharingd[764] com.apple.networkextension 17:11:52.482086+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from sharingd[764]: session in state connecting com.apple.networkextension It is clear that the connection is in a loop of submitting request to start and then failing. This problem occured only after sleep on macOS 26.0 and 15.6. This issue only occured after the system woke up from sleep. macOS 15.6 and 26.0. Is this a known problem, and how should I go about troubleshooting or resolving it?
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187
Oct ’25
utun interfaces not cleaned up using NetworkExtension
Aloha. Opening and closing VPN tunnels results in as many utun interfaces as the amount of times the tunnel has been opened. These interfaces stay present and seem to be removed only upon system reboot. We are using the NetworkExtension as a SystemExtension on macOS to create the virtual interfaces. Is this the normal behaviour. Has anybody else experienced this? utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380 inet6 fe80::8038:c353:17cd:c422%utun0 prefixlen 64 scopeid 0xf nd6 options=201<PERFORMNUD,DAD> utun1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000 inet6 fe80::cfb6:1324:d7e9:5d5%utun1 prefixlen 64 scopeid 0x10 nd6 options=201<PERFORMNUD,DAD> utun2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> utun3: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> utun4: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> utun5: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> utun6: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> utun7: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> utun8: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM>
17
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12k
Oct ’25
RCS failing on iOS 18 when VPN active
When a VPN is active, RCS messaging does not work on iOS 18. I work on an iOS VPN app, and we were very appreciative of the excludeCellularServices network flag that was released during the iOS 16 cycle. It's a great solution to ensure the VPN doesn't interfere with cellular network features from the cellular provider. Separately - As a user, I'm excited that iOS 18 includes RCS messaging. Unfortunately, RCS messaging is not working when our VPN is active (when checking on the iOS 18 release candidate). My guess is that RCS is not excluded from the VPN tunnel, even when excludeCellularServices is true. It seems like RCS should be added in this situation, as it is a cell provider service. Can RCS be added as a service that is excluded from the VPN tunnel when excludeCellularServices is true? (I've also sent this via feedback assistant, as 15094270.)
11
4
3k
Oct ’25
Network.Framework: Per-process simultaneous connection limit
We have observed a per-process limitation on the number of simultaneous nw_connection_t objects in certain macOS environments. On some systems, this limit does not appear to apply, but on others the limitation is reproducible. When a process attempts to establish a large number of connections (e.g. 512+), some connections enter the nw_connection_state_waiting state and report the POSIX error “Cannot allocate memory”. These connections remain stuck indefinitely, even after other connections are deallocated and resources should theoretically be available again. This behavior severely impacts use cases such as transparent proxies implemented via the NetworkExtension framework, which intercept system-wide traffic and must open connections on behalf of all client processes. In this scenario, a per-process limit effectively becomes a system-wide limit, leading to unexpected and hard-to-diagnose network failures in client applications. So, is there any way to disable this restriction for Network Extension processes? Are there any system settings that could affect this limitation and be modified by users?
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252
Oct ’25
need to bypass the Software Update domains in NETransparentProxy.
Hi team, We need to identify the domains used by macOS Software Update so they can be bypassed by our NETransparentProxy. The Apple support article below lists Software Update and several other Apple service domains. At the moment we’re unsure whether we should only bypass the Software Update and Beta Software domains, or whether we also need to bypass domains used for certificate validation, device management (Apple Business Manager / Apple School Manager / Apple Business Essentials), network provider updates, Apple Diagnostics, etc. We also need the specific IP ranges used exclusively by Software Update. The document shows Apple’s entire IP range; for IPv4 you can allow outbound connections to 17.0.0.0/8. https://support.apple.com/en-in/101555
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617
Oct ’25
NEFilterDataProvider Filtering Traffic to 127.0.0.1 Breaks Maven Build in IntelliJ IDEA
When filtering traffic to localhost (127.0.0.1), it causes Maven repository synchronization to fail in IntelliJ IDEA. However, Maven works correctly when local traffic is not filtered. I will provide a minimal code reproduction below. - (void)startFilterWithCompletionHandler:(void (^)(NSError *error))completionHandler { // Add code to initialize the filter NSMutableArray *rules = [NSMutableArray array]; NENetworkRule * rule = [[NENetworkRule alloc] initWithRemoteNetwork:nil remotePrefix:0 localNetwork:nil localPrefix:0 protocol:NENetworkRuleProtocolTCP direction:NETrafficDirectionAny]; [rules addObject:[[NEFilterRule alloc]initWithNetworkRule:rule action:NEFilterActionFilterData]]; rule = [[NENetworkRule alloc] initWithRemoteNetwork:nil remotePrefix:0 localNetwork:nil localPrefix:0 protocol:NENetworkRuleProtocolUDP direction:NETrafficDirectionAny]; [rules addObject:[[NEFilterRule alloc]initWithNetworkRule:rule action:NEFilterActionFilterData]]; NWHostEndpoint *hostEndpointIpv4 = [NWHostEndpoint endpointWithHostname:@"127.0.0.1" port:@"0"]; NENetworkRule *localHostRuleIpv4 = [[NENetworkRule alloc] initWithRemoteNetwork:hostEndpointIpv4 remotePrefix:32 localNetwork:hostEndpointIpv4 localPrefix:32 protocol:NENetworkRuleProtocolAny direction:NETrafficDirectionAny]; [rules addObject:[[NEFilterRule alloc]initWithNetworkRule:localHostRuleIpv4 action:NEFilterActionFilterData]]; NEFilterSettings *filterSetting = [[NEFilterSettings alloc] initWithRules:rules defaultAction:NEFilterActionAllow]; [self applySettings:filterSetting completionHandler:^(NSError * _Nullable error) { if (error) { NSLog(@"Failed to apply filter settring: %@", error.localizedDescription); } completionHandler(error); }]; } Maven Sync error: System Log: 默认 17:35:13.184509+0800 kernel cfil_inp_log:6179 <CFIL: outbound TCP data dropped for pre-existing un-filtered flow>: [41046 idea] <TCP out so 3bb6402f58a82e37 - flags 0x800840 0x80> lport 63166 fport 29735 laddr 127.0.0.1 faddr 127.0.0.1 默认 17:35:13.184510+0800 kernel cfil_inp_log:6179 <CFIL: outbound TCP data dropped for pre-existing un-filtered flow>: [41046 idea] <TCP out so d6dde374c8cb613b - flags 0x800840 0x80> lport 63165 fport 29735 laddr 127.0.0.1 faddr 127.0.0.1 默认 17:35:13.529546+0800 kernel cfil_inp_log:6179 <CFIL: outbound TCP data dropped for pre-existing un-filtered flow>: [41046 idea] <TCP out so cc915e74ba29f8cb - flags 0x800840 0x80> lport 63169 fport 39066 laddr 127.0.0.1 faddr 127.0.0.1 默认 17:35:13.529546+0800 kernel cfil_inp_log:6179 <CFIL: outbound TCP data dropped for pre-existing un-filtered flow>: [41046 idea] <TCP out so 2e15c3e54ebcc45 - flags 0x800840 0x80> lport 63168 fport 39066 laddr 127.0.0.1 faddr 127.0.0.1 默认 17:35:14.046094+0800 kernel cfil_inp_log:6179 <CFIL: outbound TCP data dropped for pre-existing un-filtered flow>: [41046 idea] <TCP out so 71f6d3a53472131f - flags 0x800840 0x80> lport 63172 fport 53241 laddr 127.0.0.1 faddr 127.0.0.1 默认 17:35:14.046145+0800 kernel cfil_inp_log:6179 <CFIL: outbound TCP data dropped for pre-existing un-filtered flow>: [41046 idea] <TCP out so c88a367c9717185b - flags 0x800840 0x80> lport 63171 fport 53241 laddr 127.0.0.1 faddr 127.0.0.1 Environment Details: Operating System: macOS 15.5 (Sequoia) IDE: IntelliJ IDEA 2025.1 Relevant Technology: NEFilterDataProvider (Network Extension) I have found reports of similar problems online: https://discussionschinese.apple.com/thread/255270330?sortBy=rank https://blog.csdn.net/weixin_42339552/article/details/137402307 They all seem to be caused by network extension。
1
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133
Oct ’25
Crash on "Dispatch queue: NEFlow queue" when __88-[NEExtensionAppProxyProviderContext setInitialFlowDivertControlSocket:extraValidation:]_block_invoke.90
I observed the following crash: Code Type: ARM-64 (Native) Parent Process: launchd [1] User ID: 0 Date/Time: 2025-10-07 13:48:29.082 OS Version: macOS 15.6 (24G84) Report Version: 12 Anonymous UUID: 8B651788-4B2E-7869-516B-1DA0D60F3744 Crashed Thread: 3 Dispatch queue: NEFlow queue Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000054 ... Thread 3 Crashed: Dispatch queue: NEFlow queue 0 libdispatch.dylib 0x000000019af6da34 dispatch_async + 192 1 libnetworkextension.dylib 0x00000001b0cf8580 __flow_startup_block_invoke.216 + 124 2 com.apple.NetworkExtension 0x00000001adf97da8 __88-[NEExtensionAppProxyProviderContext setInitialFlowDivertControlSocket:extraValidation:]_block_invoke.90 + 860 3 libnetworkextension.dylib 0x00000001b0cf8140 __flow_startup_block_invoke.214 + 172 4 libdispatch.dylib 0x000000019af67b2c _dispatch_call_block_and_release + 32 5 libdispatch.dylib 0x000000019af8185c _dispatch_client_callout + 16 6 libdispatch.dylib 0x000000019af70350 _dispatch_lane_serial_drain + 740 7 libdispatch.dylib 0x000000019af70e2c _dispatch_lane_invoke + 388 8 libdispatch.dylib 0x000000019af7b264 _dispatch_root_queue_drain_deferred_wlh + 292 9 libdispatch.dylib 0x000000019af7aae8 _dispatch_workloop_worker_thread + 540 10 libsystem_pthread.dylib 0x000000019b11be64 _pthread_wqthread + 292 11 libsystem_pthread.dylib 0x000000019b11ab74 start_wqthread + 8 ... It appears that the crash is caused by the flow director queue becoming NULL when dispatch_async is called (accessing address 0x0000000000000054). Meanwhile, my transparent proxy was still running. I'm wondering if this is a known issue or if anyone else has encountered the same problem. @eskimo
2
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584
Oct ’25
Add VPN Configuration dialog
We have a VPN application and we were required by the review team to change the text in the "Add VPN Configuration" dialog due to guideline 5.4.0 Legal: VPN Apps: make it clear to the user what data is being collected and how it will be used in the permission request. It appears that showing that information in the view preceding the VPN configuration adding attempt is no longer enough. However we haven't found any changes in the API allowing to change the text in the mentioned dialog. Is there a technical possibility to change the text in the add VPN configuration dialog? Thank you
1
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133
Oct ’25
Managing order of Transparent Proxies from MDM like JAMF
There could be a case where-in multiple transparent proxies might exist in the system (for ex., Cisco AnyConnect, GlobalProtect, etc). We want to know if there is a way to order transparent proxies so that the desired transparent proxy gets the request first. During our research, we found a resource which talks about ordering transparent proxies through MDM. https://developer.apple.com/documentation/devicemanagement/vpn/transparentproxy Using this reference, we tried to create a profile and push it through JAMF. Below is the profile that we created and pushed with JAMF. Property List - &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"&gt; &lt;plist version="1.0"&gt; &lt;dict&gt; &lt;key&gt;TransparentProxy&lt;/key&gt; &lt;array&gt; &lt;dict&gt; &lt;key&gt;ProviderBundleIdentifier&lt;/key&gt; &lt;string&gt;com.paloaltonetworks.GlobalProtect.client.extension&lt;/string&gt; &lt;key&gt;Order&lt;/key&gt; &lt;string&gt;1&lt;/string&gt; &lt;/dict&gt; &lt;dict&gt; &lt;key&gt;ProviderBundleIdentifier&lt;/key&gt; &lt;string&gt;com.cisco.anyconnect.macos.acsockext&lt;/string&gt; &lt;key&gt;Order&lt;/key&gt; &lt;string&gt;2&lt;/string&gt; &lt;/dict&gt; &lt;dict&gt; &lt;key&gt;ProviderBundleIdentifier&lt;/key&gt; &lt;string&gt;com.mydomain.transparentproxy&lt;/string&gt; &lt;key&gt;Order&lt;/key&gt; &lt;string&gt;3&lt;/string&gt; &lt;/dict&gt; &lt;/array&gt; We are not sure if this is the right way to create the profile, though JAMF is not throwing any error while pushing this profile. We see this profile on the local machine as "/Library/Managed Preferences/com.apple.networking.vpn-transparent-list.plist". Is there a way to know if the profile took effect and the order of transparent proxies has changed. Thanks in advance.
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1.5k
Oct ’25
Managing the order of Transparent Proxies from MDM Profile
We have an application which is written in Swift, which activates Transparent Proxy network extension. Our Transparent Proxy module is a system extension, which is exposing an app proxy provider interface (We are using NETransparentProxyProvider class and in extension’s Info.plist we use com.apple.networkextension.app-proxy key.) We are using JAMF MDM profile for installing our transparent proxy in customer environment. We are using VPN payload(https://developer.apple.com/documentation/devicemanagement/vpn) for this network system extension. This payload does not have any field for order. As per https://developer.apple.com/documentation/devicemanagement/vpn/transparentproxy-data.dictionary documentation there is another payload for TransparentProxy and we could create a Transparent Proxy profile using iMazingProfile Editor. Noticed that, if we add the Order attribute to the VPN/TransparentProxy payload, while installing the extension, the save to preferences fails with "Error in saving TP configuration in updateOnDemandRule permission denied" error. Can we use this Order field to ordering the installed Transparent Proxy extension in a machine? Customer devices will likely have other Transparent Proxy network extensions as well. We want to allow the Customer to control the order in which each Transparent Proxy network extension receives the network traffic. How can we set the order of the Transparent proxy extension that can be deployed using MDM profile with VPN/TransparentProxy payload? Attached the TransparentProxy payload profile for the reference. DGWebProxy_TransparentProxy_iMazing
16
1
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Oct ’25
NEHotspotNetwork headaches
I'm trying to use NEHotspotNetwork to configure an IoT. I've read all the issues that have plagued other developers when using this framework, and I was under the impression that bugs were filed and fixed. Here are my issues in hopes that someone can catch my bug, or has finally figured this out and it's not a bug in the framework with no immediate fix on the horizon. If I use the following code: let config = NEHotspotConfiguration(ssid: ssid) config.joinOnce = true KiniStatusBanner.shared.show(text: "Connecting to Kini", in: presentingVC.view) NEHotspotConfigurationManager.shared.apply(config) { error in DispatchQueue.main.async { if let nsError = error as NSError?, nsError.domain == NEHotspotConfigurationErrorDomain, nsError.code == NEHotspotConfigurationError.alreadyAssociated.rawValue { print("Already connected to \(self.ssid)") KiniStatusBanner.shared.dismiss() self.presentCaptivePortal(from: presentingVC, activationCode: activationCode) } else if let error = error { // This doesn't happen print("❌ Failed to connect: \(error.localizedDescription)") KiniStatusBanner.shared.update(text: "Failed to Connect to Kini. Try again later.") KiniStatusBanner.shared.dismiss(after: 2.5) } else { // !!!! Most often, this is the path the code takes NEHotspotNetwork.fetchCurrent { current in if let ssid = current?.ssid, ssid == self.ssid { log("✅✅ 1st attempt: connected to \(self.ssid)") KiniStatusBanner.shared.dismiss() self.presentCaptivePortal(from: presentingVC, activationCode: activationCode) } else { // Dev forums talked about giving things a bit of time to settle and then try again DispatchQueue.main.asyncAfter(deadline: .now() + 2) { NEHotspotNetwork.fetchCurrent { current in if let ssid = current?.ssid, ssid == self.ssid { log("✅✅✅ 2nd attempt: connected to \(self.ssid)") KiniStatusBanner.shared.dismiss() self.presentCaptivePortal(from: presentingVC, activationCode: activationCode) } else { log("❌❌❌ 2nd attempt: Failed to connect: \(self.ssid)") KiniStatusBanner.shared.update(text: "Could not join Kini network. Try again.") KiniStatusBanner.shared.dismiss(after: 2.5) self.cleanupHotspot() DispatchQueue.main.asyncAfter(deadline: .now() + 2) { print("cleanup again") self.cleanupHotspot() } } } } log("❌❌ 1st attempt: Failed to connect: \(self.ssid)") KiniStatusBanner.shared.update(text: "Could not join Kini network. Try again.") KiniStatusBanner.shared.dismiss(after: 2.5) self.cleanupHotspot() } As you can see, one can't just use NEHotspotConfigurationManager.shared.apply and has to double-check to make sure that it actually succeeds, by checking to see if the SSID desired, matches the one that the device is using. Ok, but about 50% of the time, the call to NEHotspotNetwork.fetchCurrent gives me this error: NEHotspotNetwork nehelper sent invalid result code [1] for Wi-Fi information request Well, there is a workaround for that randomness too. At some point before calling this code, one can: let locationManager = CLLocationManager() locationManager.requestWhenInUseAuthorization() That eliminates the NEHotspotNetwork nehelper sent invalid result code [1] for Wi-Fi information request BUT... three issues. The user is presented with an authorization alert: Allow "Kini" to use your location? This app needs access to you Wi-Fi name to connect to your Kini device. Along with a map with a location pin on it. This gives my users a completely wrong impression, especially for a device/app where we promise users not to track their location. They actually see a map with their location pinned on it, implying something that would freak out anyone who was expecting no tracking. I understand why an authorization is normally required, but since all we are getting is our own IoT's SSID, there should be no need for an authorization for this, and no map associated with the request. Again, they are accessing my IoT's network, NOT their home/location Wi-Fi SSID. My app already knows and specifies that network, and all I am trying to do is to work around a bug that makes it look like I have a successful return from NEHotspotConfigurationManager.shared.apply() when in fact the network I was looking for wasn't even on. Not only do I get instances where the network doesn't connect, and result codes show no errors, but I also get instances where I get an alert that says that the network is unreachable, yet my IoT shows that the app is connected to its Wi-Fi. On the iOS device, I go to the Wi-Fi settings, and see that I am on the IoT's network. So basically, sometimes I connect, but the frameworks says that there is no connection, and sometimes it reports a connection when there is none. As you can see in the code, I call cleanupHotspot() to make the iOS device get off of my temp Wi-Fi SSID. This is the code: func cleanupHotspot() { NEHotspotConfigurationManager.shared.removeConfiguration(forSSID: ssid) } That code gets called by the above code when things aren't as I expect and need to cleanup. And I also call it when the user dismisses the viewcontroller that is attempting to make the connection. It doesn't always work. I get stuck on the tempo SSID, unless I go through this whole thing again: try to make the connection again, this time it succeeds quickly, and then I can disconnect. Any ideas? I'm on iOS18.5, and have tried this on multiple iPhones including 11, 13 and 16.
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3
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226
Activity
Nov ’25
Content filter installed but not running
We have a content filter system extension as part of our macOS app. The filter normally works correctly, activation and deactivation works as expected but occasionally we see an issue when the content filter is activated. When this issues occurs, the filter activation appears to behave correctly, no errors are reported. Using "systemextensionsctl list" we see the filter is labelled as "[activated enabled]". However, the installed content filter executable does not run. We have seen this issue on macOS 15.3 and later and on the beta macOS 26.1 RC. It happens only occasionally but when it does there is no indication as to why the executable is not running. There are no crash logs or errors in launchd logs. Both rebooting and deactivating/activating the filter do not resolve the issue. The only fix appears to be completely uninstalling the app (including content filter) and reinstalling. I have raised a FB ticket, FB20866080. Does anyone have any idea what could cause this?
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1
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137
Activity
Oct ’25
After updating to Xcode26, the current SSID can no longer be retrieved
fetchCurrent(completionHandler:) https://developer.apple.com/documentation/networkextension/nehotspotnetwork/fetchcurrent(completionhandler:) The same code works fine in Xcode 16, but when I run the same project in Xcode 26, it doesn't work
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1
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113
Activity
Oct ’25
Routing Packets.
I am new to iOS development and boldly decided to work on a project using the Network Extension with the goals of intercepting all incoming packets (not exclusive to my app), creating temporary copies, passing through the original unmodified packet, and then processing the copy. I currently have a Packet Tunnel that intercepts all IPv4 packets, but I do not know how to route them. The goal is to keep everything on the device for privacy concerns. So I have a few questions in mind: Is a packet tunnel necessary? I am reading into the Content Filter, but I am unsure if I can use it due to Apple's own apps possibly bypassing it. Is it possible to route packets collected from the tunnel? I thought about using NE Relays, but to my knowledge I cannot use the packets I obtained to do this. Are there any references to existing implementations I can look through? Are there any other unforeseen issues I might encounter while developing this? I can provide more information about the project I am working on if necessary. Any advice, references or sample code will be appreciated. Thanks in advance!
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3
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126
Activity
Oct ’25
URL filter app with multiple configurations
Hello, We've been working on an app that uses the new NEUrlFilter API and we've got a question. Currently, the system is designed with the assumption that a single app == usecase == single remote database. But what if we would like to give the user the ability to use different blocklists? For example, the user may want to: Block scam domains Block tracking domains Block adult domains Or any composition of these 3 What should we do to give the user this option? It seems that we could differentiate different databases by using different PIR service hostnames, but that would also mean that we'll have to send several requests for the same usecase but with different PIR service hostnames (and they'll all share the same app bundle ID). Will these requests be accepted then? If not, is there an alternative? PS: By sending a request I mean submitting this form
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173
Activity
Oct ’25
Upgrading NEFilterDataProvider Causes System Network Interruption
Hi, when I perform an overlay installation via a PKG on macOS for an application containing the NEFilterDataProvider functionality, there is a chance that the entire system network becomes unreachable. Disabling the corresponding Content Filter in "System Settings > Network > Filters" immediately restores network connectivity. This issue does not occur every time, with a frequency of approximately 1 in 20 installation attempts.  The following details may help identify the problem: The Filter.app containing the NEFilterDataProvider resides within the main app's Resources directory, e.g., /Applications/Main.app/Contents/Resources/Filter.app Main.app is installed via a PKG; the issue typically occurs during an overlay installation of Main.app. The NEFilterDataProvider operates as a System Extension. The func handleNewFlow(_ flow: NEFilterFlow) -> NEFilterNewFlowVerdict {} returns .allow. Wireshark packet captures show TCP packets but no UDP packets; TCP handshakes cannot complete. Disabling the corresponding content filter in "System Settings > Network > Filters" restores the network; re-enabling it breaks connectivity again. After waiting for a period, approximately 30-60 minutes, network connectivity can recover automatically. What causes this and how can it be fixed? Any workarounds?
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186
Activity
Oct ’25
SystemExtension approve failed on mac15.x
Hello, I'm an application developer related to Apple system extensions. I developed an endpoint security system extension that can run normally before the 14.x system. However, after I upgraded to 15.x, I found that when I uninstalled and reinstalled my system extension, although the system extension was installed successfully, a system warning box would pop up when I clicked enable in the Settings, indicating a failure. I conducted the following test. I reinstalled a brand-new MAC 15.x system. When I installed my applications, the system extensions could be installed successfully and enabled normally. However, when I uninstalled and reinstalled, my system extension couldn't be enabled properly and a system warning popped up as well. I tried disabling SIP and enabling System Extension Developers, but it still didn't work. When the system warning box pops up, I can see some error log information through the console application, including an error related to Failed to authorize right 'com.apple.system-extensions.admin' by client '/System/Library/ExtensionKit/Extensions/SettingsSystemExtensionController.appex' [2256] for authorization created by '/System/Library/ExtensionKit/Extensions/SettingsSystemExtensionController.appex' [2256] (3,0) (-60005) (engine 179) as shown in the screenshot. The same problem, mentioned in Cannot approve some extensions in MacOS Sequoia , but there is no solution
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3
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872
Activity
Oct ’25
The network connection fails with NEFilterDataProvider and QQMusic running at the same time
The environment: macOS 12.0 ~ 15.6 A NetworkExtension NEFilterDataProvider configured with filterSockets = YES, filterPackets = NO, and it doesn't actually block any network connection. QQMusic (download: https://y.qq.com/n/ryqq/download_detail/mac?ADTAG=YQQ) is constantly playing. Any of the following operations can reproduce the issue: Kill the NetworkExtension process and then restarted by the system. Disable the NEFilterDataProvider, and then enable it. When this problem occurs, there are two different phenomena on the NetworkExtension process: It is zombie, or is in high CPU state (100%). When the NetworkExtension process is zombie, obviously, the new network connections will enter it, and they can't be disposed by the old zombie process, so the network is disconnected. Spindump-qqmusic-ne-zombie When the NetworkExtension process is in high CPU state, its thread DispatchQueue "NEFilterExtensionProviderContext queue" is blocked in the kernel when calling close. Spindump-qqmusic-ne-cpuhigh In most cases, the network will recover after stopping QQ Music, that is the suspended zombie NetworkExtension process will exist or the cpu of it return to normal. To reproduce the issue in a simple environment, I have tried many ways to simulate the network behavior of QQMusic, but all failed. It seems that this issue is caused by UDP traffic of QQMusic, because everything is ok after blocking the UDP connections of QQMusic (the music is still playing at this time) in the NEFilterDataProvider.
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2
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259
Activity
Oct ’25
VPN Stuck at connecting
Hello, I’ve run into some strange behavior with the macOS System Extension using a Packet Tunnel. The issue showed up after the device went to sleep while the VPN was running. When I woke the computer, the VPN tried to reconnect but never succeeded — it just stayed stuck in the “connecting” state. I was able to turn the VPN off, but every attempt to turn it back on failed and got stuck at “connecting” again. Even removing the VPN configuration from Settings didn’t help. The only thing that worked was disabling the system extension completely. While checking the logs, I noticed thousands of identical log messages appearing within just a few seconds: nesessionmanager(562) deny(1) system-fsctl (_IO "h" 47) 17:11:52.481498+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5454 com.apple.networkextension 17:11:52.481568+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5454 com.apple.networkextension 17:11:52.481580+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5454 com.apple.networkextension 17:11:52.481587+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5454 com.apple.networkextension 17:11:52.481646+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5446 com.apple.networkextension 17:11:52.481664+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5446 com.apple.networkextension 17:11:52.481671+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5446 com.apple.networkextension 17:11:52.481676+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5446 com.apple.networkextension 17:11:52.481682+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5446 com.apple.networkextension 17:11:52.481687+0200 NESMVPNSession[Primary Tunnel:Secure DNS: got On Demand start message from pid 5446 com.apple.networkextension After the burst of these repeated messages, I started seeing logs like the following: 17:11:52.481759+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Spotify Helper[69038] com.apple.networkextension 17:11:52.481790+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Spotify Helper[69038]: session in state connecting com.apple.networkextension 17:11:52.481949+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Spotify Helper[69038] com.apple.networkextension 17:11:52.481966+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Spotify Helper[69038]: session in state connecting com.apple.networkextension 17:11:52.481986+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Spotify Helper[69038] com.apple.networkextension 17:11:52.481992+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Spotify Helper[69038]: session in state connecting com.apple.networkextension 17:11:52.482003+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Spotify Helper[69038] com.apple.networkextension 17:11:52.482011+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Spotify Helper[69038]: session in state connecting com.apple.networkextension 17:11:52.482022+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Spotify Helper[69038] com.apple.networkextension 17:11:52.482028+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Spotify Helper[69038]: session in state connecting com.apple.networkextension 17:11:52.482039+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Spotify Helper[69038] com.apple.networkextension 17:11:52.482049+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Spotify Helper[69038]: session in state connecting com.apple.networkextension 17:11:52.482060+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from Slack Helper[84828] com.apple.networkextension 17:11:52.482069+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from Slack Helper[84828]: session in state connecting com.apple.networkextension 17:11:52.482079+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Received a start command from sharingd[764] com.apple.networkextension 17:11:52.482086+0200 NESMVPNSession[Primary Tunnel:Secure DNS: Skip a start command from sharingd[764]: session in state connecting com.apple.networkextension It is clear that the connection is in a loop of submitting request to start and then failing. This problem occured only after sleep on macOS 26.0 and 15.6. This issue only occured after the system woke up from sleep. macOS 15.6 and 26.0. Is this a known problem, and how should I go about troubleshooting or resolving it?
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3
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187
Activity
Oct ’25
utun interfaces not cleaned up using NetworkExtension
Aloha. Opening and closing VPN tunnels results in as many utun interfaces as the amount of times the tunnel has been opened. These interfaces stay present and seem to be removed only upon system reboot. We are using the NetworkExtension as a SystemExtension on macOS to create the virtual interfaces. Is this the normal behaviour. Has anybody else experienced this? utun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1380 inet6 fe80::8038:c353:17cd:c422%utun0 prefixlen 64 scopeid 0xf nd6 options=201<PERFORMNUD,DAD> utun1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 2000 inet6 fe80::cfb6:1324:d7e9:5d5%utun1 prefixlen 64 scopeid 0x10 nd6 options=201<PERFORMNUD,DAD> utun2: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> utun3: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> utun4: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> utun5: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> utun6: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> utun7: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM> utun8: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1300 options=6463<RXCSUM,TXCSUM,TSO4,TSO6,CHANNEL_IO,PARTIAL_CSUM,ZEROINVERT_CSUM>
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17
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0
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12k
Activity
Oct ’25
RCS failing on iOS 18 when VPN active
When a VPN is active, RCS messaging does not work on iOS 18. I work on an iOS VPN app, and we were very appreciative of the excludeCellularServices network flag that was released during the iOS 16 cycle. It's a great solution to ensure the VPN doesn't interfere with cellular network features from the cellular provider. Separately - As a user, I'm excited that iOS 18 includes RCS messaging. Unfortunately, RCS messaging is not working when our VPN is active (when checking on the iOS 18 release candidate). My guess is that RCS is not excluded from the VPN tunnel, even when excludeCellularServices is true. It seems like RCS should be added in this situation, as it is a cell provider service. Can RCS be added as a service that is excluded from the VPN tunnel when excludeCellularServices is true? (I've also sent this via feedback assistant, as 15094270.)
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11
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4
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3k
Activity
Oct ’25
Network.Framework: Per-process simultaneous connection limit
We have observed a per-process limitation on the number of simultaneous nw_connection_t objects in certain macOS environments. On some systems, this limit does not appear to apply, but on others the limitation is reproducible. When a process attempts to establish a large number of connections (e.g. 512+), some connections enter the nw_connection_state_waiting state and report the POSIX error “Cannot allocate memory”. These connections remain stuck indefinitely, even after other connections are deallocated and resources should theoretically be available again. This behavior severely impacts use cases such as transparent proxies implemented via the NetworkExtension framework, which intercept system-wide traffic and must open connections on behalf of all client processes. In this scenario, a per-process limit effectively becomes a system-wide limit, leading to unexpected and hard-to-diagnose network failures in client applications. So, is there any way to disable this restriction for Network Extension processes? Are there any system settings that could affect this limitation and be modified by users?
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3
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252
Activity
Oct ’25
need to bypass the Software Update domains in NETransparentProxy.
Hi team, We need to identify the domains used by macOS Software Update so they can be bypassed by our NETransparentProxy. The Apple support article below lists Software Update and several other Apple service domains. At the moment we’re unsure whether we should only bypass the Software Update and Beta Software domains, or whether we also need to bypass domains used for certificate validation, device management (Apple Business Manager / Apple School Manager / Apple Business Essentials), network provider updates, Apple Diagnostics, etc. We also need the specific IP ranges used exclusively by Software Update. The document shows Apple’s entire IP range; for IPv4 you can allow outbound connections to 17.0.0.0/8. https://support.apple.com/en-in/101555
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617
Activity
Oct ’25
NEFilterDataProvider Filtering Traffic to 127.0.0.1 Breaks Maven Build in IntelliJ IDEA
When filtering traffic to localhost (127.0.0.1), it causes Maven repository synchronization to fail in IntelliJ IDEA. However, Maven works correctly when local traffic is not filtered. I will provide a minimal code reproduction below. - (void)startFilterWithCompletionHandler:(void (^)(NSError *error))completionHandler { // Add code to initialize the filter NSMutableArray *rules = [NSMutableArray array]; NENetworkRule * rule = [[NENetworkRule alloc] initWithRemoteNetwork:nil remotePrefix:0 localNetwork:nil localPrefix:0 protocol:NENetworkRuleProtocolTCP direction:NETrafficDirectionAny]; [rules addObject:[[NEFilterRule alloc]initWithNetworkRule:rule action:NEFilterActionFilterData]]; rule = [[NENetworkRule alloc] initWithRemoteNetwork:nil remotePrefix:0 localNetwork:nil localPrefix:0 protocol:NENetworkRuleProtocolUDP direction:NETrafficDirectionAny]; [rules addObject:[[NEFilterRule alloc]initWithNetworkRule:rule action:NEFilterActionFilterData]]; NWHostEndpoint *hostEndpointIpv4 = [NWHostEndpoint endpointWithHostname:@"127.0.0.1" port:@"0"]; NENetworkRule *localHostRuleIpv4 = [[NENetworkRule alloc] initWithRemoteNetwork:hostEndpointIpv4 remotePrefix:32 localNetwork:hostEndpointIpv4 localPrefix:32 protocol:NENetworkRuleProtocolAny direction:NETrafficDirectionAny]; [rules addObject:[[NEFilterRule alloc]initWithNetworkRule:localHostRuleIpv4 action:NEFilterActionFilterData]]; NEFilterSettings *filterSetting = [[NEFilterSettings alloc] initWithRules:rules defaultAction:NEFilterActionAllow]; [self applySettings:filterSetting completionHandler:^(NSError * _Nullable error) { if (error) { NSLog(@"Failed to apply filter settring: %@", error.localizedDescription); } completionHandler(error); }]; } Maven Sync error: System Log: 默认 17:35:13.184509+0800 kernel cfil_inp_log:6179 <CFIL: outbound TCP data dropped for pre-existing un-filtered flow>: [41046 idea] <TCP out so 3bb6402f58a82e37 - flags 0x800840 0x80> lport 63166 fport 29735 laddr 127.0.0.1 faddr 127.0.0.1 默认 17:35:13.184510+0800 kernel cfil_inp_log:6179 <CFIL: outbound TCP data dropped for pre-existing un-filtered flow>: [41046 idea] <TCP out so d6dde374c8cb613b - flags 0x800840 0x80> lport 63165 fport 29735 laddr 127.0.0.1 faddr 127.0.0.1 默认 17:35:13.529546+0800 kernel cfil_inp_log:6179 <CFIL: outbound TCP data dropped for pre-existing un-filtered flow>: [41046 idea] <TCP out so cc915e74ba29f8cb - flags 0x800840 0x80> lport 63169 fport 39066 laddr 127.0.0.1 faddr 127.0.0.1 默认 17:35:13.529546+0800 kernel cfil_inp_log:6179 <CFIL: outbound TCP data dropped for pre-existing un-filtered flow>: [41046 idea] <TCP out so 2e15c3e54ebcc45 - flags 0x800840 0x80> lport 63168 fport 39066 laddr 127.0.0.1 faddr 127.0.0.1 默认 17:35:14.046094+0800 kernel cfil_inp_log:6179 <CFIL: outbound TCP data dropped for pre-existing un-filtered flow>: [41046 idea] <TCP out so 71f6d3a53472131f - flags 0x800840 0x80> lport 63172 fport 53241 laddr 127.0.0.1 faddr 127.0.0.1 默认 17:35:14.046145+0800 kernel cfil_inp_log:6179 <CFIL: outbound TCP data dropped for pre-existing un-filtered flow>: [41046 idea] <TCP out so c88a367c9717185b - flags 0x800840 0x80> lport 63171 fport 53241 laddr 127.0.0.1 faddr 127.0.0.1 Environment Details: Operating System: macOS 15.5 (Sequoia) IDE: IntelliJ IDEA 2025.1 Relevant Technology: NEFilterDataProvider (Network Extension) I have found reports of similar problems online: https://discussionschinese.apple.com/thread/255270330?sortBy=rank https://blog.csdn.net/weixin_42339552/article/details/137402307 They all seem to be caused by network extension。
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133
Activity
Oct ’25
Network Extensions section, the Packet Tunnel section is not displayed
Configure the App ID in the Apple Developer Portal. In the Network Extensions section, the Packet Tunnel section is not displayed, as shown in the figure below How to proceed with the configuration of App ID. In the Network Extensions section: Display the Packet Tunnel section Our account is a China region account
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115
Activity
Oct ’25
In the Network Extensions section, the Packet Tunnel section is not displayed
Configure the App ID in the Apple Developer Portal. In the Network Extensions section, the Packet Tunnel section is not displayed How to proceed with the configuration of App ID. In the Network Extensions section: Display the Packet Tunnel section Our account is a China region account
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121
Activity
Oct ’25
Crash on "Dispatch queue: NEFlow queue" when __88-[NEExtensionAppProxyProviderContext setInitialFlowDivertControlSocket:extraValidation:]_block_invoke.90
I observed the following crash: Code Type: ARM-64 (Native) Parent Process: launchd [1] User ID: 0 Date/Time: 2025-10-07 13:48:29.082 OS Version: macOS 15.6 (24G84) Report Version: 12 Anonymous UUID: 8B651788-4B2E-7869-516B-1DA0D60F3744 Crashed Thread: 3 Dispatch queue: NEFlow queue Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000054 ... Thread 3 Crashed: Dispatch queue: NEFlow queue 0 libdispatch.dylib 0x000000019af6da34 dispatch_async + 192 1 libnetworkextension.dylib 0x00000001b0cf8580 __flow_startup_block_invoke.216 + 124 2 com.apple.NetworkExtension 0x00000001adf97da8 __88-[NEExtensionAppProxyProviderContext setInitialFlowDivertControlSocket:extraValidation:]_block_invoke.90 + 860 3 libnetworkextension.dylib 0x00000001b0cf8140 __flow_startup_block_invoke.214 + 172 4 libdispatch.dylib 0x000000019af67b2c _dispatch_call_block_and_release + 32 5 libdispatch.dylib 0x000000019af8185c _dispatch_client_callout + 16 6 libdispatch.dylib 0x000000019af70350 _dispatch_lane_serial_drain + 740 7 libdispatch.dylib 0x000000019af70e2c _dispatch_lane_invoke + 388 8 libdispatch.dylib 0x000000019af7b264 _dispatch_root_queue_drain_deferred_wlh + 292 9 libdispatch.dylib 0x000000019af7aae8 _dispatch_workloop_worker_thread + 540 10 libsystem_pthread.dylib 0x000000019b11be64 _pthread_wqthread + 292 11 libsystem_pthread.dylib 0x000000019b11ab74 start_wqthread + 8 ... It appears that the crash is caused by the flow director queue becoming NULL when dispatch_async is called (accessing address 0x0000000000000054). Meanwhile, my transparent proxy was still running. I'm wondering if this is a known issue or if anyone else has encountered the same problem. @eskimo
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584
Activity
Oct ’25
Add VPN Configuration dialog
We have a VPN application and we were required by the review team to change the text in the "Add VPN Configuration" dialog due to guideline 5.4.0 Legal: VPN Apps: make it clear to the user what data is being collected and how it will be used in the permission request. It appears that showing that information in the view preceding the VPN configuration adding attempt is no longer enough. However we haven't found any changes in the API allowing to change the text in the mentioned dialog. Is there a technical possibility to change the text in the add VPN configuration dialog? Thank you
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133
Activity
Oct ’25
Managing order of Transparent Proxies from MDM like JAMF
There could be a case where-in multiple transparent proxies might exist in the system (for ex., Cisco AnyConnect, GlobalProtect, etc). We want to know if there is a way to order transparent proxies so that the desired transparent proxy gets the request first. During our research, we found a resource which talks about ordering transparent proxies through MDM. https://developer.apple.com/documentation/devicemanagement/vpn/transparentproxy Using this reference, we tried to create a profile and push it through JAMF. Below is the profile that we created and pushed with JAMF. Property List - &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"&gt; &lt;plist version="1.0"&gt; &lt;dict&gt; &lt;key&gt;TransparentProxy&lt;/key&gt; &lt;array&gt; &lt;dict&gt; &lt;key&gt;ProviderBundleIdentifier&lt;/key&gt; &lt;string&gt;com.paloaltonetworks.GlobalProtect.client.extension&lt;/string&gt; &lt;key&gt;Order&lt;/key&gt; &lt;string&gt;1&lt;/string&gt; &lt;/dict&gt; &lt;dict&gt; &lt;key&gt;ProviderBundleIdentifier&lt;/key&gt; &lt;string&gt;com.cisco.anyconnect.macos.acsockext&lt;/string&gt; &lt;key&gt;Order&lt;/key&gt; &lt;string&gt;2&lt;/string&gt; &lt;/dict&gt; &lt;dict&gt; &lt;key&gt;ProviderBundleIdentifier&lt;/key&gt; &lt;string&gt;com.mydomain.transparentproxy&lt;/string&gt; &lt;key&gt;Order&lt;/key&gt; &lt;string&gt;3&lt;/string&gt; &lt;/dict&gt; &lt;/array&gt; We are not sure if this is the right way to create the profile, though JAMF is not throwing any error while pushing this profile. We see this profile on the local machine as "/Library/Managed Preferences/com.apple.networking.vpn-transparent-list.plist". Is there a way to know if the profile took effect and the order of transparent proxies has changed. Thanks in advance.
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3
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1.5k
Activity
Oct ’25
Managing the order of Transparent Proxies from MDM Profile
We have an application which is written in Swift, which activates Transparent Proxy network extension. Our Transparent Proxy module is a system extension, which is exposing an app proxy provider interface (We are using NETransparentProxyProvider class and in extension’s Info.plist we use com.apple.networkextension.app-proxy key.) We are using JAMF MDM profile for installing our transparent proxy in customer environment. We are using VPN payload(https://developer.apple.com/documentation/devicemanagement/vpn) for this network system extension. This payload does not have any field for order. As per https://developer.apple.com/documentation/devicemanagement/vpn/transparentproxy-data.dictionary documentation there is another payload for TransparentProxy and we could create a Transparent Proxy profile using iMazingProfile Editor. Noticed that, if we add the Order attribute to the VPN/TransparentProxy payload, while installing the extension, the save to preferences fails with "Error in saving TP configuration in updateOnDemandRule permission denied" error. Can we use this Order field to ordering the installed Transparent Proxy extension in a machine? Customer devices will likely have other Transparent Proxy network extensions as well. We want to allow the Customer to control the order in which each Transparent Proxy network extension receives the network traffic. How can we set the order of the Transparent proxy extension that can be deployed using MDM profile with VPN/TransparentProxy payload? Attached the TransparentProxy payload profile for the reference. DGWebProxy_TransparentProxy_iMazing
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16
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754
Activity
Oct ’25