Take the 2-minute tour ×  I'm using Ubuntu 11.10, lightdm. It
appears my XDMCP service is setup correctly, but it won't
connect.  I have the following in /etc/lightdm/lightdm.conf:
To restart lightdm the following command is issued:  sudo
restart lightdm  This produces the following log file in
/var/log/lightdm/lightdm.log:  [+0.01s] DEBUG: Launching X
Server [+0.01s] DEBUG: Launching process 6947: /usr/bin/X :0
-auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.01s] DEBUG: Waiting for ready signal from X server :0
[+0.01s] DEBUG: Starting XDMCP server on UDP/IP port 177
[+0.02s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.02s] DEBUG: Registering seat with bus path
/org/freedesktop/DisplayManager/Seat0 [+0.17s] DEBUG: Got signal
10 from process 6947  No errors.  So far so good.. looks like
the XDMCP service is started.  However, even though it looks
like it's started without any error, it fails to connect. The
problem may be related to nothing listening on TCP port 6000?
netst