How does one use X forwarding properly? I got a server running CentOS 6.3 at runlevel 3 (no DE installed) I try to access virt-manager via x-forwarding from another CentOS 6.3 client in my network (runlevel 5 with default gnome) on The server i changed my sshd_config: X11Forwarding yes i installed xauth on both of the machines. Anything else there is to do? When i try to: ssh -X root at server virt-manager I still get the following error message: RuntimeError: could not open display Which is in fact a message i get with every graphical programm i try to run through that. So I guess it's an error in my ssh configuration. Any tips?