libssh and python twisted conch ssh

[Johannes Krude <johannes@xxxxxxxx>]

hi,

I am trying to interface a libssh client with a python twisted conch
server. Unfortunately the key exchange does no succeed. It seems libssh
rejects the key exchange initiation. Below are detailed logs and dumps.
Does twisted send malformed data, does libssh not recognize compliant
data, or is this some other kind of problem?

Greetings, johannes


./samplessh from both 0.5.2 and rev de096910b37ca3474fc37d421fb051a234f5cce0
shows:
Connection failed : Timeout connecting to xx.xx.xx.xx

An anonymized pcap from rev de09...
(use with `cat | base64 -d | gzip -d > file.pcap`):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My own libssh client using 0.5.2 with high LOG_VERBOSITY says:
[1] libssh 0.5.2 (c) 2003-2010 Aris Adamantiadis (aris@xxxxxxxxxxxx)
Distributed under the LGPL, please refer to COPYING file for information
about your rights, using threading threads_noop
[3] host xx.xx.xx.xx matches an IP address
[2] Nonblocking connection socket: 3
[2] Socket connecting, now waiting for the callbacks to work
[3] ssh_connect: Actual timeout : 30000
[3] Received POLLOUT in connecting state
[1] Socket connection callback: 1 (0)
[3] Received banner: SSH-2.0-Twisted
[1] SSH server banner: SSH-2.0-Twisted
[1] Analyzing banner: SSH-2.0-Twisted
[3] Enabling POLLOUT for socket
[1] Error : Timeout connecting to xx.xx.xx.xx
[3] ssh_connect: Actual state : 9
ssh_connect: Timeout connecting to xx.xx.xx.xx
[3] Writing on the wire a packet having 16 bytes before
[3] 16 bytes after comp + 11 padding bytes = 28 bytes packet
[3] Enabling POLLOUT for socket