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How to make X11 Forwarding via SSH work behind a firewall?

Posted on 2013-01-17
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Last Modified: 2013-01-19
When I SSH to the remote system, our firewall let's the connection through.  But when I launch the app whose windows I want to redirect, X11 keeps trying to connect to port 6000 which is blocked on my end.  

The local machine is Windows using Putty and Xming.
The remote machine is AIX.
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Question by:fuze44
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Expert Comment

by:omarfarid
ID: 38790352
When you do forwarding of X11 via ssh then it is doing tunneling and no extra port is needed.

In the case of running X11, the system that runs the display is the server (windows) and the system that run the X11 application is the client (AIX).

You need to check for the proper config of the X11 S/W and SSH on the windows system.
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Author Comment

by:fuze44
ID: 38794293
Do I understand you correctly that the single SSH connection between whatever port is opened on the Windows box and port 22 on the AIX is the only connection that is made?
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omarfarid earned 2000 total points
ID: 38794440
Yes, if forwarding / tunneling of X11 session via ssh then it is only that port. This is done to avoid changing the firewall policy.
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Author Closing Comment

by:fuze44
ID: 38795182
Thank you.
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Expert Comment

by:omarfarid
ID: 38795981
Welcome
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