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Some servers do not forward X11, but I do not know why.

from [Christopher L. Barnard] Network Security [Permanent Link]
Subject: Some servers do not forward X11, but I do not know why.
Date: Tue, 6 Dec 2005 10:25:23 -0600 (CST) 

I do not have newsgroup access, so I cannot pose this question on
comp.security.ssh.  The mailing list archives do not appear to have a
solution.  Hopefully you can help me.

I have two identical Sun Solaris 9 servers.  Both are running OpenSsh
version 4.2p1.  Both have identical ssh_config and sshd_config files.  One
allows me to run X programs and they are displayed back on my desktop.
The other one reports

Error: Can't open display:

What am I missing to force this server to set the DISPLAY variable so that
X11 will be forwarded?  As I say the ssh_config and sshd_config files are
identical with a server that works, and in particular ssh_config:

ForwardX11 yes

and sshd_config:

X11Forwarding yes
X11UseLocalhost no

+-----------------------------------------------------------------------+
| Christopher L. Barnard         O     When I was a boy I was told that |
| cbarnard@tsg.cbot.com         / \    anybody could become president.  |
| (312) 347-4901               O---O   Now I'm beginning to believe it. |
| http://www.cs.uchicago.edu/~cbarnard                --Clarence Darrow |
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