Re: SSH channel forwarding fails on ieof

[Aris Adamantiadis <aris@xxxxxxxxxxxx>]

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.
>