Comment 49 for bug 150193

@Benítez Esquivel:
In my case "Xnest :1 -query 127.0.0.1" wasn't work locally on my machine, restarting gdm has changed nothing.
Then I do the (so i believe) most importend step, i use the command "sudo gdmflexiserver --command="UPDATE_CONFIG" and restart gdm via "sudo /etc/init.d/gdm restart" from the textconsole. After that, Xnest works ! But unfortunately it works only on my own machine locally.
Now I've tried DisallowTCP=false, because it was set true before - thanks to Benìtez Esquivel - after updating and restarting gdm i could see the gdm-login-screen from my xming-windowsxp client - BUT after logging in nothing happens - no desktop appears, only an empty brown window.
Thinking on my problems with XFCE and XDMCP on my old Feisty-Server i'd remember, that there was problems with the ESD-Enlightenment Sound Deamon, wich can transport Audio from the server to the client, but Cygwin/xming doesn't support this. On Windows there is no ESD at default. So I turn all Audiosettings to ALSA instead automatic.
Then i do the update-command and restarts gdm like obove - and voila - i can login and work with xming !

Very strange, so i think - something went totally wrong with this gdm-thing...why this doesn't work automatically? In my oppinion this is a bug in the init.d-script: it does not update the settings for gdm before gdm (re)starts.

Hope this helps someone :-)