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By default remote x-windows (port 6000) is disabled in Ubuntu. Now one easy way around this is just to use ssh to login with port forwarding like such:
$ ssh -X host
This will set the DISPLAY variable automatically and any X program you run will be automatically tunneled back through the ssh connection.
Otherwise we're going to need to enable it. Here's how:
- Go to System->Administration->Login Window (or run gdmsetup as root)
- Under the security tab uncheck "Deny TCP connections to Xserver"
Now we have to restart gdm which will kill our Xsession.
kill -HUP 'cat /var/run/gdm.pid'
or if you prefer to edit
/etc/gdm.conf
by hand, make sure there are no overriding settings in/etc/gdm.conf-custom
. Under the security section changeDisallowTCP
to false.