Lost connection to the debugger
1 min readJun 29, 2021
Issue: disconnected all the time from the debugger
macOS: BigSur
Xcode: 12.3
Error:

Actual Error:
dating selectors failed with: Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service on pid 0 named com.apple.commcenter.coretelephony.xpc was invalidated." UserInfo={NSDebugDescription=The connection to service on pid 0 named com.apple.commcenter.coretelephony.xpc was invalidated
Resolution:
Solution 1
- After booting the desired simulator
- Run below command in terminal
xcrun simctl spawn booted log config --mode "level:off" --subsystem
com.apple.CoreTelephony
If above does not resolve your issue, follow:
Solution 2
- Create a file called
.lldbinit
on your home directory (~
) - Add this line to the file:
settings set plugin.process.gdb-remote.packet-timeout 300
- Restart Xcode and try again
- If the issue is not resolved for you try deleting derived data, format the simulator, do pod cache clean, restart the machine, and repeat the steps above.
Reference: