On iOS beta, monitoring network usage using the getifaddrs API sporadically causes system volume spikes. This happens even though the application does not interact with any audio-related code. The issue persists across different polling intervals (e.g., 0.05s to 1s) and only occurs when invoking getifaddrs. Replacing the API calls with mock data eliminates the problem, suggesting a potential issue with getifaddrs in the beta environment. The application updates UI elements based on network activity, but the volume spikes occur independently of UI or other observable app behavior. Steps to Reproduce: Create an app that monitors network usage using the getifaddrs API. Fetch network statistics on a timer (e.g., every 0.05 seconds). Observe system behavior while running the app on iOS beta. Note sporadic volume spikes during app runtime. Expected Result: Polling network usage with getifaddrs should not affect system volume or other unrelated resources. Actual Result: System volume spikes occasionally when network statistics are retrieved using getifaddrs. iOS 18.2 Beta, Tested on physical device ( iPhone 15 Pro )

Hi, I built a system that can detect and block Short Form Videos like Instagram Reels and Youtube Shorts. It works by connecting the iphone to a VPN and then do statistics on network packets (no decryption). I was wondering the feasibility of porting this to run on device. Functionality wise I would need: packet interception, packet drop, DNS query interception. I saw that Content filter providers could be something to look into, but then I read an article of how you would have to have a managed device which is not ideal for the end user. New to apple development, the lack of snippets and code examples is confusing.

How can I resolve the error（Code=65 "No route to host）. Xcode 16(SDK ios18): We invoke GCDAsyncUdpSocket to send UDP data to the broadcast address,then get Error Domain=NSPOSIXErrorDomain Code=65 "No route to host" Xcode 16.1 beta 2(SDK ios18.1): We invoke GCDAsyncUdpSocket to send UDP data to the broadcast address,then it work fine. Xcode 15.4(SDK ios17.5): We invoke GCDAsyncUdpSocket to send UDP data to the broadcast address,then it work fine. Notes: Privacy - Local Network Usage Description and the multicast entitlement has been added. Bonjour services has been added _http._tcp、_http._udp Code: GCDAsyncUdpSocket *gcdUdpSearchSocket = [[GCDAsyncUdpSocket alloc] initWithDelegate:self delegateQueue:dispatch_get_main_queue()]; NSError *error = nil; if (![gcdUdpSearchSocket enableBroadcast:YES error:&error]){ NSLog(@"gcdUdpSearchSocket enableBroadcast Error binding: %@", error); return; } if (![gcdUdpSearchSocket bindToPort:UDP_PORT error:&error]) { NSLog(@"GCDUdp Error binding: %@", error); return; } if (![gcdUdpSearchSocket beginReceiving:&error]) { NSLog(@"GCDUdp Error receiving: %@", error); return; }

I have a TVML style app on the app store that no longer seems to work. I'm working on converting it to SwiftUI after seeing the WWDC video "Migrate your TVML app to SwiftUI". I've got most of the code working up until I'm trying to display video from a remote source (my website). It looks like the network connection is blocked, maybe. On a macOS app I see a App Sandbox capabilities that include Network access. I don't see that option for the tvOS app. Am I missing something or is it not needed, and I should look elsewhere? Thanks, David

when i set the flag false to the usesClassicLoadingMode, then the application is getting crashed Ex: let config = URLSessionConfiguration.default if #available(iOS 18.4, *) { config.usesClassicLoadingMode = false } Crash log : *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFBoolean objectForKeyedSubscript:]: unrecognized selector sent to instance 0x1f655c390' *** First throw call stack: (0x188ae52ec 0x185f69a7c 0x188b4f67c 0x1889fcb84 0x1889fc4f0 0x191393bc8 0x1889ec8a0 0x1889ec6e4 0x191393ad0 0x191344dac 0x191344b58 0x107cfa064 0x107ce36d0 0x191343fcc 0x1891b3b18 0x1892dae58 0x189235c60 0x18921e270 0x18921d77c 0x18921a8ac 0x107ce0584 0x107cfa064 0x107ce891c 0x107ce95d8 0x107ceabcc 0x107cf5894 0x107cf4eb0 0x212f51660 0x212f4e9f8) terminating due to uncaught exception of type NSException

Hi all, I'm struggling to identify the cause of a really strange issue that has started to plague our network of Mac devices. We use Cisco switches and have port security turned on which means any device that registers more than one MAC address triggers a port violation which then shuts down the port for a short period of time (5 mins I believe). A few months ago we suddenly started get lots of violations from Mac devices the were all registering additional MAC addresses (2 usually) that all had the same 6 character prefix (00:00:40). So far we've not been able to determine the cause and now getting pretty desperate and exploring all possible avenues. All we know id that prefix is registered to a company called Applicon from back in the day but is now shut down. Has anyone come across this issue or know of any possible reason why this may be happening? Thanks

Hi, For one our requirement sendProviderMessage is been used to send some event/message from app to system extension, In my requirement, responseHandler in system extension would get explicitly called approximately after 1 min due to some async download file task. But observing some strange behavior that responseHandler is getting called implicitly after ~20-30 seconds even before the code hit the place where its called explicitly. And that is the only place I'm calling responseHandler. Can somebody please help about this strange behavior, Is there any implicit timeout interval associated with the responseHandler. Thanks & Regards, Preethi

way to display it is by holding the Option key and clicking the Wi-Fi icon. In macOS 14.0, wdutil was still usable, but in 14.6.1, the returned information is now . I am unsure if there is an official way to obtain the corresponding BSSID. I need to process the BSSID in my code, so either a command-line tool or an API would work.

Hello there, I'm trying to consume graph.microsoft.com API by using URLSession. But I'm getting Error 400 from the server every time when I send a request with URLSession, but not if I use Postman for the same request. And when I examined the requests with Fiddler, I noticed that URLSession use HTTP/2, and Postman use HTTP/1.1. According to the Microsoft's documentation graph.microsoft.com supports only HTTP/1.1. As I understand URLSession decides to which version of HTTP to use during ALPN and will use HTTP/2 only if the server support it. My question is it possible the graph server to advertise itself as its support HTTP/2 and how to determinate this? Or maybe, which is more likely URLSession has bug that make it to do the wrong assumption about the HTTP/2. And most important there is there a mechanism to make URLSession to use a certain version of HTTP? Thank you in advance, Emil

on MacOS I am using raw socket and PF_Route options to monitor the routing table changes but looks like that is not supported in iOS what are the other ways to achieve real time monitoring in iOS ?

hello, we're currently working on a way to adapt the behavior of our app when the device is running with a low free memory remaining, or a bad network. For the network, we though about implementing a speedtest, but the issue with this solution is that we want to test regularly the quality of the network, so if the device is running with a poor/bad network, the speedtest with stuck the app. I was looking for other way to check the displayed informations in the status bar: private func getWiFiRSSI() -> Int? { let app = UIApplication.shared var rssi: Int? let exception = tryBlock { guard let statusBar = app.value(forKey: "statusBar") as? UIView else { return } if let statusBarMorden = NSClassFromString("UIStatusBar_Modern"), statusBar .isKind(of: statusBarMorden) { return } guard let foregroundView = statusBar.value(forKey: "foregroundView") as? UIView else { return } for view in foregroundView.subviews { if let statusBarDataNetworkItemView = NSClassFromString("UIStatusBarDataNetworkItemView"), view .isKind(of: statusBarDataNetworkItemView) { if let val = view.value(forKey: "wifiStrengthRaw") as? Int { rssi = val break } } } } if let exception = exception { print("getWiFiRSSI exception: \(exception)") } return rssi } I've checked the AppStore Guidelines but I'm not sure that this kind of code will not be subject to rejection by the Review team. Anyone having trying to submit with a similar approach? Did you already managed to monitor network regularly, without using a speedtest? Thanks for the help!

Hi I am developing the packet tunnel extension on a SIP enabled device. If I build the app and notarize and install it on the device, it works fine. If I modify, build and execute the App (which contains the system extension), it fails with below error. 102.3.1.4 is production build. And 201.202.0.101 is for XCode build. SystemExtension "<<complete name>>.pkttunnel" request for replacement from 102.3.1.4 to 201.202.0.101 Packet Tunnel SystemExtension "<<complete name>>.pkttunnel" activation request did fail: Error Domain=OSSystemExtensionErrorDomain Code=8 "(null)" If SIP is disabled, it works fine. Is there a way the system extension can be developed even if SIP remains enabled?

On my macOS 15.x device, frequently encountering the error: Error Domain=com.apple.wifi.apple80211API.error Code=-528342014 "tmpErr" when connecting to an EAP WiFi network using CWWiFiClient. Restarting the device temporarily resolves the issue, but it reoccurs after some time. What could be causing this, and how can it be resolved programmatically?

I'm looking to develop an iOS application that functions as a remote for Apple TV, including discovering Apple TV devices over Wi-Fi. If anyone has experience building similar applications, could you share insights on available frameworks or protocols to discover Apple TVs? Additionally, if there are reference apps on the App Store that work like Apple's default remote app, I would greatly appreciate recommendations. Any guidance from developers who have worked on similar projects would be very helpful!

We have product for network monitoring and we are't able to add support auto-instrumenting the networking requests for URLSession async/wait methods as these methods are't exposed to dynamic environment or not exposed to ObjC and we con't use any of the run-time functionality and we con't override these methods as these methods are't public. looking for a way to add some kind of logic so that when customers use our product they don't have to add any code from there end to monitor this system.

PLATFORM AND VERSION iOS Development environment: Xcode 16.0, macOS 15.0.1 Run-time configuration: iOS 17.5.1 DESCRIPTION OF PROBLEM We are working on an iOS application that utilizes the NEFilterDataProvider class from the Network Extension framework to control network flows. However, we are encountering an issue where network flows are not being detected as expected. Here are the details of our setup: We are using the NEFilterDataProvider class to filter network traffic in our app. The filtering setup works well for certain flows/apps, but we cannot detect Facebook network flows as intended. The app is correctly configured with the necessary entitlements, and we have set up the required App Groups and Network Extension capabilities. We would like to request guidance on how to troubleshoot or resolve this issue. Could you provide insights on: Whether there are any known limitations or conditions under which network flows may not be detected by NEFilterDataProvider. Recommendations for additional debugging techniques to better understand why some flows might not be captured. Recommendations for additional code to be added to detect some flows that might not be captured. Any specific scenarios or configurations that might be causing this issue in iOS. STEPS TO CHECK Replace below code in FilterDataProvider. Try running the app and set debugger in FilterDataProvider. Launch Facebook app. You will observe that no NEFilterFlow is detected in handleNewFlow for actions such as posts, reels, etc. import NetworkExtension class FilterDataProvider: NEFilterDataProvider { let blockedDomains = [ "facebook.com" ] override func startFilter(completionHandler: @escaping (Error?) -> Void) { // Perform any necessary setup here. DNSLogger.shared.log(message: "Filter started") completionHandler(nil) } override func stopFilter(with reason: NEProviderStopReason, completionHandler: @escaping () -> Void) { // Perform any necessary cleanup here. DNSLogger.shared.log(message: "Filter stopped with reason: \(reason)") completionHandler() } override func handleNewFlow(_ flow: NEFilterFlow) -> NEFilterNewFlowVerdict { var url: URL? if let urlFlow = flow as? NEFilterBrowserFlow { url = urlFlow.url } else { let urlFlow = flow as? NEFilterSocketFlow url = urlFlow?.url } guard let hostName = url?.host else { return .allow() } DNSLogger.shared.log(message: "Domain reveived: \(hostName)") return .allow() } // Handle inbound data (data received from the network) override func handleInboundData(from flow: NEFilterFlow, readBytesStartOffset offset: Int, readBytes: Data) -> NEFilterDataVerdict { DNSLogger.shared.log(message: "Inbound data: \(readBytes)") return .needRules() } // Handle outbound data (data sent to the network) override func handleOutboundData(from flow: NEFilterFlow, readBytesStartOffset offset: Int, readBytes: Data) -> NEFilterDataVerdict { // Inspect or modify outbound data if needed // For example, you could log the data or modify it before sending DNSLogger.shared.log(message: "Outbound data: \(readBytes)") return .needRules() } override func handleRemediation(for flow: NEFilterFlow) -> NEFilterRemediationVerdict { return .needRules() } override func handleRulesChanged() { // Handle any changes to the rules } }

Note that AsyncDNSResolver is a fairly new Apple sponsored framework (search for it). I am trying to resolve a hostname (behind a CNAME) but cannot. In face even "ping" in mac Terminal can't. The host I start with is apidev.leaptodigital.com - when I ask for its CNAME: resolver.queryCNAME(name: "apidev.leaptodigital.com") I get: salespro-dev-server-2.eba-uxpxmksr.us-east-1.elasticbeanstalk.com Great! But nothing I try with that hostname returns an IP address. I tried queryCNAME again, then queryA, then queryAAAA. Yet I can send http traffic to this host, so its getting resolved somewhere. Note that nslookup in Terminal finds it just fine. David PS: tried older APIs like CFHostStartInfoResolution but they don't return anything either. Did not try getHostName as its use is discouraged.

Hi everyone, I’ve been working with the NEPacketTunnelProvider class and came across the cancelTunnelWithError() method. The documentation mentions its general purpose but doesn’t provide much clarity on how and when it should be called. From what I’ve gathered in other forum posts, it seems that cancelTunnelWithError() should be called within my own implementation of the stopTunnel() method, but I’m not entirely sure if that’s the correct usage or whether there are specific scenarios where this applies. Here are my specific questions: Is it correct to always call cancelTunnelWithError() in my implementation of stopTunnel()? Are there specific conditions or scenarios where cancelTunnelWithError() is the preferred way to terminate a tunnel session, rather than other termination methods? What does the system do with the error that I pass to cancelTunnelWithError()? Does it have an impact on how the session termination is handled? Are there best practices or common pitfalls to avoid when using cancelTunnelWithError()? Any insights, examples, or guidance would be greatly appreciated! Thanks in advance for your help!

I have an iPhone app which relies heavily on TCP/IP communication in the local network. Therefore, the application starts a server socket and accepts incoming connections. This worked flawlessly for a long time and we had no problems with this. Problem In the last days however, we observed that for some iPhones with the server role other devices cannot connect to the server of our app. The server does not accept incoming connections on the devices IP address and the client times out. Environment Both iPhones (the server and the client) are in the same network with 192.168.1.0 address range and 255.255.255.0 subnet mask. The server has the IP 192.168.1.11 and the client has 192.168.1.22. This is a normal home WiFi network with no special firewall rules. Both devices have mobile data disabled and the "access local network" permission is granted. The server socket is bound to all interfaces (0.0.0.0). More technical symptoms When the server iPhone is in this faulty state, it seems like it somehow has two ip addresses: 192.168.2.123 and 192.168.1.11 The WiFi preferences show the (correct) .1.11 ip address. The Apps however see the (wrong) .2.123 ip address. I cannot explain where the other ip address comes from and why the device thinks it has this ip address. I've collected interface diagnosis information on a faulty iPhone and it listed the following interfaces and IPs: en0 -> 192.168.2.123 lo0 -> 127.0.0.1 pdp_ip0 (cellular) -> 192.0.0.2 pdp_ip1 to pdp_ip6 (cellular) -> -/- ipsec0 to ipsec6 (vpn) -> -/- llw0 (vpn) -> -/- awdl0 -> -/- anpi0 -> -/- ap1 -> -/- XHC0 -> -/- en1 and en2 (wired) -> -/- utun0 to utun2 (vpn) -> -/- The correct ip of the device is not listed anywhere in this list. A reboot helped to temporarily fix this problem. One user reported the same issue again a few hours later after a reboot. Switching off WiFi and reconnecting does not solve the problem. This issue occurred on several iPhones with the following specs: iOS Version 18.1.1, 18.3.1 iPhone 13 Pro, iPhone 13 Pro Max, iPhone 15 Pro The problem must be on the server side as the client can successfully connect to any other device in the same network. Question(s) Where does this second IP come from and why does the server not accept connections to either ip even though it is bound to 0.0.0.0? Are there any iOS system settings which could lead to this problem? (privacy setting, vpn, ...) What could be done to permanently fix this issue?

According to the Apple documentation, if this value is NO, the Wi-Fi connection will be disconnected after the application is used for 30 minutes; but after actual testing, it doesn't happen. So what exactly is the specific function of UIRequiresPersistentWiFi? If the value of UIRequiresPersistentWiFi is NO, it will disconnect Wi-Fi. What conditions does the device need to meet or in which situations will it disconnect Wi-Fi?