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Cygwin: Unable to initialize GTK: could not open display

I've got a Win 10 box with Cygwin and the X packages installed. I run xlaunch and start up the X server. I then do "ssh -Y user@myserver". Then I su and run virt-manager. I get an error: 

Cygwin: Unable to initialize GTK: could not open display

echo $DISPLAY shows:

localhost:10.0

I've tried changing it with EXPORT DISPLAY=localhost:0.0 with no luck.

I've googled and read all of the similar questions but none address my problem, as simple as I'm sure it is.

Solution

  • Starting from xorg-server version 1.17 , the option -nolisten tcp is now the default, so the server only accepts local connections on a unix domain socket.

    To allow connection by TCP you should use the option -listen that has been added to restore the previous behaviour.

    As reported by the package maintainer:
    https://sourceware.org/ml/cygwin-announce/2015-10/msg00111.html