Missing server connection for kCTConnectionInvalidatedNotification

Question

Created Jan ’18

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Hey guys!

While I am debugging my application I often see the following log :Missing server connection for kCTConnectionInvalidatedNotification.
After running strings on the CoreTelephony Framework I found out that the notification is part of that framework:

$ strings /Applications/Xcode-9.0.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/System/Library/Frameworks/CoreTelephony.framework/CoreTelephony.tbd

Any ideas what could be causing this log? The notification is private, so its not that I could be listening to it...

The reason I came up here posting the issue is because I have a lot of users complaining of LTE dropping its connection on application start. Most of those complains come from iPhone X. Even after enabling CFNetworking logs ( setenv("CFNETWORK_DIAGNOSTICS", "3", 1); ) there is nothing weird, at least when I test with my devices...

I would like to add that the connection drops are happeing basically on iPhone X and some iPhone 8. Other devices rarely having connection drops.

Are there any known issues of new iPhones dropping its LTE signal?

Thanks in advance!

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Answer 1

DTS Engineer OP

Apple

Jan ’18

> Are there any known issues of new iPhones dropping its LTE signal? Not that I’m aware of, but such issues would likely come in via AppleCare rather than DTS. From a _developer’s_ perspective, nothing you do should cause the device to lose cellular signal. My best guess here is that these users are having a general problem with their device and have just happened to notice it while using your app. However, that’s just a guess. Regardless, the way forward here is to file a bug with both baseband and sysdiagnose logs (see our [*Bug Reporting* > *Profiles and Logs*][pandl] page for details on these). [pandl]: If you want to poke around in the sysdiagnose log to see if there’s any connection to your app, that’s cool. But the most important thing is to get this info to Apple R&D engineering. Share and Enjoy — Quinn “The Eskimo!” Apple Developer Relations, Developer Technical Support, Core OS/Hardware `let myEmail = "eskimo" + "1" + "@apple.com"`

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Answer 2

marcterns OP

Jan ’18

I synced the sysdiagnose logs to my mac. Not sure exactly what logs I should be looking at since the `/Library/Logs/CrashReporter/MobileDevice/MyIphone/ has plenty of files, folders etc... The actual sysdiagnose.log looks like its generating a bunch of different plists and logs, but I dont know exaclty ones applies to my scenario.

Do you think you could point me to the right direction? Thank you!

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