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First off, thanks to everyone that took the time to respond, and for all of the suggestions on what to try to fix the problem. For me, here's the solution. My thanks for Peer-Joachim Koch for the initial hint, and then some further sleuthing. By default, the X-server starts with the option "-nolisten tcp" which means that the X-server will not listen for connections over TCP. You can check this by looking at the process list: ps -aef | grep X and noting that the X-server started with the "-nolisten tcp" turned on: root 2762 ... /usr/X11R6/bin/X :0 -audit 0 -auth -nolisten tcp /var/dgm/:0.Xauth vt7 Now you need to find out where that's launched from. It might be /etc/X11/XF86Config In my case it was /etc/X11/gdm/gdm.conf, and I needed to edit the line: #DisallowTCP=true to DisallowTCP=false Basically, the default is to have "nolisten tcp" enabled, so it was commented out; you have to set the flag correctly. Then I rebooted to restart the process without the option turned on. With an open terminal or xterm window, you set xhost to accept a remote X-session: xhost + remotemachinename and then log into the remote machine ssh -X [EMAIL PROTECTED] and set the environment variable DISPLAY setenv DISPLAY localmachinename:0.0 ccp4i comes up fine now. I never got "ssh -Y" to work. I think it's because our RH-WS4 is using OpenSSH rather than SSH2. Bernie Santarsiero
