X server enabling
X server listening for TCP connections
X-windows traditionally uses TCP port 6000 to listen for
connections from remote client systems to display on the local X server
netstat -na | grep 6000
to see if the server is listening on port 6000. If not, confirm the
server is explicitly not listening for TCP connections.
ps -efw | grep X
/usr/X11R6/bin/X :0 -br -audit 0
-auth /var/lib/gdm/:0.Xauth -nolisten tcp vt7
Depending on your distro reconfigure the X server to listen to TCP,
and log out or reboot, so the X server is restarted.
- Older Ubuntu
- In the [Security] section of /etc/gdm/gdm.conf-custom ,
/etc/gdm/gdm.conf is overwritten by other automatic events, so any
manual changes to that file will be lost.
- (newer ubuntu)
- On less old ubuntu, this file may no longer
exist – try creating instead
/etc/gdm/custom.conf containing just
- X on Ubuntu
- Change /etc/X11/xinit/xserverrc from
exec /usr/bin/X -nolisten tcp "$@"
exec /usr/bin/X "$@"
- Ubuntu with lightdm
- Edit /etc/lightdm/lightdm.conf to include
- start gdmsetup
On the "Security" tab, uncheck the "Disallow TCP connection"
Tell the X server which clients to accept connections from
The xhost command configures for a session which hosts to
accept connections from. If you are on a network where you feel safe,
the simplest option is to allow all connections. From a console session
on the X server issue