A fatal error has occured and Cygwin will now exit. Please open XWin.log

I recently faced a annoying problem with the free application Cygwin version 2.5.

Every time a user ran startx in the application a fatal error appear:

“A fatal error has occured and Cygwin will now exit. Please open /tmp/XWin for more information.”

The actual error message within the Xwindows was:

$ startx

Welcome to the XWin X Server

Vendor: The Cygwin/X Project

Release: 6.8.99.901-4

Contact: cygwin-xfree@cygwin.com

XWin was started with the following command line:

X :0 -multiwindow -clipboard

Fatal server error:

Cannot open log file “/tmp/XWin.log”

winDeinitMultiWindowWM - Noting shutdown in progress

giving up.

xinit: Connection refused (errno 111): unable to connect to X server

xinit: No such process (errno 3): Server error.

Troubleshooting Steps:

1. Ensure taht all relevant users have the permissions to write to the /tmp/XWin.log

2. Backup the /tmp/XWin.log and delete it

3. Attempt to run startx again.

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