XDMCP Warnings

• Used by itself, XDMCP is NOT SECURE.
• Like telnet, xdmcp connections are not encrypted and can be easily eavesdropped on.
• Anything you type in, including passwords, can be captured by anyone else on the network.
• Any data you do not wish disclosed to others can be easily captured by anyone else on the network.
• Instead, encrypt your connection to the remote computer with ssh tunneling. See below.

Prerequisites

• An X11 server installed on your local machine
  • Under Windows, purchase a copy of Exceed from CU Software Licensing
  • Under MAC OS X, install the X11 which came with your copy of OS X
  • Under other unices, install XFree86 or Xorg
• A ssh client
  • Under Windows, google for and install the free TTSSH or Putty
  • Under Mac OS X, commandline ssh is built in
  • Under unices, commandline ssh is built in

Jeol (using XDMCP)

Windows

1. Double click the Jeol9300 or Jeol6300 icon on the Windows desktop (this will auto start a special XMing)

SunRay (JEOL 9300)

1. Open a terminal
2. Run:

3. Xnest :1 -query jeol.cnf.cornell.edu

   1. In the above command, if server screen :1 is in use, you should try :2 or :3 or so on
4. Login to the jeol
5. Keep in mind that your connection between calico and jeol is NOT encrypted

JEOL 6300 (ssh)

Windows

1. Start XMing
2. Open Putty
3. Under Connection → SSH → X11, check the box to "Enable X11 Forwarding"
4. Under Session, for the Host Name, enter in jeol6300.cnf.cornell.edu
5. The username and password are available from the JEOL6300 tool managers.
6. In the JEOL6300 terminal, type in commands to locally display the remotely running GUI JEOL applications.

SunRays

1. Open a terminal
2. Assuming the username is jeol_username (username and password are available from the JEOL6300 tool managers), type in

   ssh -Y jeol_username@jeol6300.cnf.cornell.edu

Korat/Minx

• Only accessible from a local CNF network

1. If on a CNF Windows system, first start XMing
2. On either CNF Windows or SunRays, double click the Korat or the Minx icon on your Desktop (also under the Applications menu on SunRays)
3. You will be prompted for your CNF username and password
4. If you receive an error about being unable to lock your .Xauthority file, please see [Xauthority Locking Issues Wiki Page|]
5. Type in the name of the application, such as "ledit" or "LayoutBEAMER" you wish to run.