Red Hat Bugzilla – Bug 53308
openssh port forwarding fails.
Last modified: 2008-05-01 11:38:00 EDT
Using openssh to port forward for IRC fails when the server is openssh-2.5
On a Red Hat 7.1 or 7.2-beta box, try:
ssh -L 6667:irc.openprojects.net:6667 (some7.1or7.2box)
and in another terminal type:
irc somenick irc.openprojects.net (any server seems to show the same
tcpdump and observe the traffic on both the loopback interface and the
link to the outside world. You'll see that the IRC client is sending
commands which aren't being forwarded by sshd. ircii and xchat suffer, but
strangely using telnet or nc to connect makes it work.
When the server is a 7.0 box with openssh-2.3.0p1-4, it works fine.
Argh. I need more coffee. Obviously the irc command has to be:
irc somenick localhost
This problem still exists in the latest openssh erratum. (2.9p2-9)
I've verified that a clean build of the OpenSSH 3.0p1 RPM does not have this
problem. Either it's been fixed in the 3.0 release, or it was a Red Hat patch
which introduced the bug.
A clean build of the OpenSSH 2.9p2 RPM also has this bug - so it wasn't
introduced by one of the Red Hat patches, it was present in the original source.
This means that upgrading to 3.0p1 ought to fix it.
What are the chances of an erratum release, or do we have to find a remote root
before that can happen?
Verified. This problem is incredibly annoying. Got 3.0.* RPM's
Is this expected to be fixed by the openssh-2.9p2-11 erratum?
This might be the same problem that's giving me fits with fetching email:
Now that I've been told by the upstream developers that there was a relevant
bug fix in openssh 2.9.9, I would really like to see us issue something newer
3.1 is going out as an errata soonish, but the fixes may show up in Raw Hide