How to debug XWin starting only sometimes?

[Jon Turney]

On 01/05/2017 16:19, Leon Meier wrote:
> When starting "XWin Server" though the windows shortcut, it sometimes
> won't start; other times it will.

Sorry to hear that you are having this problem.

[...]
> Any hints who may be the culprit and/or how to debug the issue?

It might be useful to compare the logs between an successful and 
unsuccessful startup attempt.  The differences might be a useful clue.

 > In /var/log/xwin/XWin.0.log.old we see
 >
 > [   775,375] winMultiWindowXMsgProc - Fatal error 1 on xcb connection

I'm guessing that perhaps this was from an unsuccessful previous run? 
In which case I would be interested to see the whole log.

-- 
Jon Turney
Volunteer Cygwin/X X Server maintainer

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