Tunnelling X11 via ssh
2007-12-25 2:12:00
I'm having trouble tunnelling X11 vi ssh.
I have a feeling that my problem may be a configuration
problem on my sun system(s), rather than just an ssh
issue, hence my query here.
I want to display the X client on a Solaris 2.8 system. I will call that
system "mydesktop." I have SSH Secure Shell 3.2.5 installed on that
system.
The X client (HP Openview NNM, if it matters) will run on/from a
separate Sun server, myserver, also Solaris 2.8, also with SSH
Secure Shell 3.2.5 installed.
I compiled and installed SSH on both systems taking the defaults:
checking whether to install ssh-signer as suid root... yes
checking whether to disable tcp-port forwardings... no
checking whether to disable X11 forwarding... no
On mydesktop,
in /etc/ssh2/ssh2_config:
ForwardX11 yes
xauth is in my path on mydesktop
(although I'm not sure it matters:)
/usr/openwin/bin/xauth
Xaccess does not have any entries, just comment lines.
On myserver,
in /etc/ssh2/sshd2_config:
AllowX11Forwarding yes
There is not a firewall or any other traffic filtering device between
the two systems.
Here's the issue as I have it diagnosed so far--the proxy DISPLAY variable
on myserver doesn't get created when I log in via ssh:
mydesktop%> echo $DISPLAY
mydesktop:0.0
mydesktop%> ssh +x jana at myserver
jana's password:
Authentication successful.
myserver%> echo $DISPLAY
DISPLAY: Undefined variable
myserver%> printenv | grep -i display
The +X (treat X applications as trusted)
flag does not make a difference, but I think
the problem occurs before I get to that point anyway.
I believe I have problems (configuration errors?) with both mydesktop and
myserver.
I have eXceed on a PC; with that PC I can ssh to another sun server
that I don't manage (I'll call it otherserver) and successfully tunnel X
through ssh. The DISPLAY variable is set correctly when I ssh to
otherserver using the PC version of ssh. I am able to display X clients
from otherserver on my PC/eXceed.
However, when I connect with eXceed to the server system I manage,
myserver,
the DISPLAY variable is not set.
Also, with I use ssh to connect from mydesktop to otherserver, the DISPLAY
variable is not set when I've logged in to otherserver.
Any suggestions as to what I might have wrong, or suggestions as to how
I might troubleshooting this issue? The "verbose" mode for ssh and sshd
wasn't particularly helpful. I didn't see any messages relating to X11,
at least at the default debugging level.
Thanks much,
Jana Dunn
jana at scsr.nevada.edu
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