Screen sharing crash

Question

I try to do a screen sharing session from the application Screens on iOS to my iMac, and it connects , but the connection is shut down after a few seconds.  I get a crash report on the Mac, which I include below.  This only happens when I connect from outside my network, not locally, and it doesn&#x27;t happen with my other two Macs, even remotely.  I&#x27;m using a secure connection over SSH.  I have shown the crash report to the Screens developers, and they think this has nothing to do with their software. Any ideas? (Trying to post the  crash report here, I&#x27;m told it contains invalid characters. How can I make it available?)

John Galt · Answer

You can post the crash report elsewhere and provide a link to it, but it&#x27;s really a moot point. Their software; they own the crashes and whatever information the crash reports can provide to them. There is very little chance it will make sense to anyone else. In the very unlikely event that it does, it will implicate a conflict with other software. That is the only potential factor you may be able to control.... they think this has nothing to do with their software.Of course not. Their software must be perfect, right? 😝If the Screens app is crashing, it&#x27;s obviously up to its developer to fix it. Apple&#x27;s interest in third party software is nil.

Knut Harald Støre · Answer

As the crash report shows, it is not any third-party software which is crashing, but the screen sharing agent built into macOS.  I&#x27;ll paste parts of the report here, and see if that works. Process:               ScreensharingAgent [7563]Path:                  /System/Library/CoreServices/RemoteManagement/ScreensharingAgent.bundle/Content s/MacOS/ScreensharingAgentIdentifier:            ScreensharingAgentVersion:               3.9.2 (3.9.2)Code Type:             X86-64 (Native)Parent Process:        ??? [1]Responsible:           ScreensharingAgent [7563]User ID:               503Date/Time:             2017-04-13 00:38:19.866 +0200OS Version:            Mac OS X 10.12.4 (16E195)Report Version:        12Anonymous UUID:        8A155160-7CD6-11E8-EEE7-1269CCFC4A22Time Awake Since Boot: 51000 secondsSystem Integrity Protection: enabledCrashed Thread:        4Exception Type:        EXC_BAD_ACCESS (SIGSEGV)Exception Codes:       KERN_INVALID_ADDRESS at 0x000000011697e044Exception Note:        EXC_CORPSE_NOTIFYTermination Signal:    Segmentation fault: 11Termination Reason:    Namespace SIGNAL, Code 0xbTerminating Process:   exc handler [0]........Thread 4 Crashed:0   com.apple.screensharing.agent    0x000000010fbc28a7 0x10fbac000 + 923271   com.apple.screensharing.agent    0x000000010fbc439b 0x10fbac000 + 992272   com.apple.screensharing.agent    0x000000010fbc0803 0x10fbac000 + 839713   com.apple.screensharing.agent    0x000000010fbb6897 0x10fbac000 + 431594   com.apple.screensharing.agent    0x000000010fbaec4b 0x10fbac000 + 113395   com.apple.screensharing.agent    0x000000010fbaf2d3 0x10fbac000 + 130116   libsystem_kernel.dylib            0x00007fffbc1b80b7 mach_msg_server + 4857   com.apple.screensharing.agent    0x000000010fbb9692 0x10fbac000 + 549308   libsystem_pthread.dylib           0x00007fffbc2aa9af _pthread_body + 1809   libsystem_pthread.dylib           0x00007fffbc2aa8fb _pthread_start + 28610  libsystem_pthread.dylib           0x00007fffbc2aa101 thread_start + 13

Knut Harald Støre · Answer

Turning off screen scaling solved the problem.