Re: SSH channel forwarding fails on ieof

[Pugnator <ookami@xxxxxxx>]

Thanks a lot for your reply.
Yes, it is the case for me as I'm creating multiple channels simultaneously.
I used stable repo from Debian 7. I followed your suggestion and 
compiled 0.6rc.
The issue was not reproduced after it.


On 09/25/2013 12:36 AM, Aris Adamantiadis wrote:
> Hi,
>
> Could you try again with libssh 0.5.5 or 0.6rc and tell me if you can
> reproduce the problem ? This behaviour recalls me of a bug that has been
> fixed in 0.5.3, and would happen when you open multiple channels. Is it
> the case ?
>
> Thanks,
>
> Aris
>
> Le 24/09/13 18:21, Pugnator a écrit :
> > I use libssh 0.5.2 binding for C under Linux. In my program I create SSH
> > tunnel to XenServer. It worked perfectly until I updated to the most
> > recent XenServer 6.2. After it ssh tunneling started failing with
> >
> > [1] Analyzing banner: SSH-2.0-OpenSSH_4.3
> > [1] We are talking to an OpenSSH client version: 4.3 (40300)
> > [1] placing 18 bytes into channel buffer (stderr=0)
> > [1] Error : Channel opening failure: channel 44 error (2) Connection
> > refused
> >
> > On server side there is records in /var/log/secure:
> >
> > Sep 24 20:12:10 proxima sshd[20782]: pam_unix(sshd:session): session
> > opened for user root by (uid=0)
> > Sep 24 20:12:10 proxima sshd[20792]: Accepted password for root from
> > 10.250.144.221 port 55673 ssh2
> > Sep 24 20:12:10 proxima sshd[20792]: pam_unix(sshd:session): session
> > opened for user root by (uid=0)
> > Sep 24 20:12:11 proxima sshd[16132]: channel_by_id: 0: bad id: channel free
> > Sep 24 20:12:11 proxima sshd[16132]: Disconnecting: Received ieof for
> > nonexistent channel 0.
> > Sep 24 20:12:11 proxima sshd[16132]: pam_unix(sshd:session): session
> > closed for user root
> >
> >
> > The most strange is the ssh server version is the same on old and new
> > servers:
> > OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008
> >
> > I'm not sure how to debug such an issue. Sometimes tunnel establishes
> > and works but it is 1 out of 100 tries.