hi eskimo, Thanks for ur reply, have tested following combinations with Xcode 15.1 beta 3: 1.iOS 17.1.1/ iOS 12.5.7, minimum deployment target 11, NWParameters.init() works fine 2.iOS 16/15, minimum deployment target 11, NWParameters.init() crash 3.iOS 16/15, minimum deployment target 12: NWParameters.init() works fine Just curious if iOS 11 is no longer supported by Xcode 15, how this inconsistency situations happened?. Could this inconsistency be attributed to a new linker issue introduced in Xcode 15.0 here https://developer.apple.com/forums/thread/738317 ? I'm wondering if there's a chance for this to be addressed in a future release. Could you please help to confirm? Thanks