Set a VNC Password
vncpasswd
Start the VNC Server
vncserver
Remember number at the end:
New 'X' desktop is ww8-node1.ww.uni-erlangen.de:#
Create a Tunnel
ssh -nNT -L 5900:localhost:5900 [USERNAME]@ww8[CLIENT].ww.uni-erlangen.de
Connect to the VNC Server from your Client
Use the Remote Desktop Viewer
And connect to localhost:#
. The number behind de double point is the important thing.