4dfda130_Network_Security__Description_and_exceptions
X-Window graphics No access, except via ssh tunnel. [Description and exceptions] 
The XDMCP protocol, which gives a complete remote console with full graphical interface, is limited to the local Earth Sciences network only, as it sends passwords over the network in plain text mode, and can permit hackers to spy on your system. If you need to open an X-window to display results on your computer in Earth Sciences from a program running on a computer outside Earth Sciences, use an ssh X-window tunnel.
Network Security
Description and exceptions