Cygwin/X not working under Windows 11

Tue Feb 18 19:04:47 GMT 2025

On 18/02/2025 14:56, Erik Dybdahl via Cygwin wrote:
> Hi,
> I have been using Cygwin for the last twenty years, and fifteen years ago a
> colleague of mine introduced me to Cygwin/X.
> I've used it ever since, because it's much better to have Xterm windows
> controlled by this than to have a number of mintty instances started under
> and controlled by MS Windows.
>> Sadly, after switching to a new laptop running Windows 11, it does not work
> anymore.
> This is the bin/X.sh script I've been using:
> #!/bin/sh
> export DISPLAY=":0.0"
> export XENVIRONMENT="${HOME}/.Xresources"
> XWin -clipboard -dpi 200 &
> sleep 5
> echo "Starting wmaker..."
> wmaker &
> wait
>> and here is how it was started:
>> C:\cygwin64\bin\mintty.exe /bin/bash -l -e
> c:\cygwin64\home\dybdaeri\bin\X.sh
>> This starts XWin.exe, with a few Xterm windows in it.
>> Now, on my new laptop, only a blank screen is shown, and I am not able to
> get any xterm window presented there.

Perhaps you could try the simplest possible way of running things as a test:
XWin :0 &
DISPLAY=:0.0 xterm
If I understand correctly, this gives you a server window (titled 
"Cygwin/X:0.0"), but no xterm window inside it.
If the xterm client can't connect to the server, this might be due to a 
interference from some firewall software (as the Cygwin UNIX domain 
socket used here is emulated by Cygwin using a loopback TCP/IP socket).