DISPLAY and XAUTHORITY will automatically be set to their proper values. Note that you do not need to set any environment variables on the server. In the unlikely case xauth was installed in a nonstandard location, it can be called through ~/.ssh/rc (on the server!).

If there are any X11 programs there, it's very likely that xauth will be there. The xauth program must be installed on the server side. Note that the default is no forwarding (some distributions turn it on in their default /etc/ssh/sshd_config), and that the user cannot override this setting. On the server side, X11Forwarding yes must specified in /etc/ssh/sshd_config. On the client side, the -X (capital X) option to ssh enables X11 forwarding, and you can make this the default (for all connections or for a specific conection) with ForwardX11 yes in ~/.ssh/config. X11 forwarding needs to be enabled on both the client side and the server side. If you have both #1 and #2 in place but are missing #3, then you'll end up with an empty DISPLAY environment variable. To get X11 forwarding working over ssh, you'll need 3 things in place.ġ.Your client must be set up to forward X11.Ģ.Your server must be set up to allow X11 forwarding.ģ.Your server must be able to set up X11 authentication.

Mobaxterm x11 forwarding