 | | | weird ssh or X problem | weird ssh or X problem 2005-07-20 - By David Minor
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My apologies if this has been addressed previously - I didn't see
anything for it in the archives.
We're in the process of upgrading to RedHat Enterprise version 4 and
are seeing a strange ssh or X problem. We're using a vanilla install.
The only change we've made is two variables in sshd_config - we've
got the following variables uncommented: X11UseLocalhost no
X11Forwarding yes.
Here's what happens:
1) User ssh's into remote machine (machine1.company.com) which is
running the new version. Tries to run an X process, say xclock. User
is told:
Error: Can't open display: machine.company.com:10.0
User keeps this session open.
2) User opens a second ssh session to the same remote machine. Runs
xclock - it works. On this second session the client has been handed
the same display (machine1.company.com:10.0) as the first session.
3) User goes back to first session. Now xclock works in that session
also.
4) If user logs out of second session, X stops working on first session.
We see this behavior regardless of the ssh client used (we've tested
Linux, OSX, HP-UX). It also doesn't matter if we use X forwarding on
the client (via -X or -Y) either.
Note that if a user doesn't have concurrent ssh sessions open, X
never works.
Further looking at it indicates that this *might* be an X problem?
1) First connection to the machine (using ssh again). It's handed
display 10. X does not work. Telnetting to localhost 6010 gives a
"connection refused" message.
2) Second connection to the machine (again using ssh). Handed the
same display. X works. Telnetting to localhost 6010 now works. So
there's something going on with the way ports are being opened.
3) Also, the machine simply isn't listening on port 6000. Compare this:
On the machine with the problem:
machine1.domain.com: netstat -an | grep 6000
machine1.domain.com: [nothing]
a different machine running RHEL version 3:
machine2.domain.com: netstat -an | grep 6000
tcp 0 0 0.0.0.0:6000
0.0.0.0:* LISTEN
Anyone else see this problem or have any suggestions??
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