Wily validation failing due to paramiko SSHException: Incompatible ssh peer (no acceptable kex algorithm)

[Ryan Beisner]

Wily validation failing due to paramiki SSHException: Incompatible ssh peer (no acceptable kex algorithm)

This started in the past few days, though I've not pinned it down to a particular cause. Appears to be >= Wily only. Same code works everywhere else, and used to work against Wily deployments.

0:33:29.789 INFO:root:Socket connect OK for 172.17.119.187 port 22.
00:33:29.808 ERROR:paramiko.transport:Exception: Incompatible ssh peer (no acceptable kex algorithm)
00:33:29.809 ERROR:paramiko.transport:Traceback (most recent call last):
00:33:29.810 ERROR:paramiko.transport: File "/usr/lib/python2.7/dist-packages/paramiko/transport.py", line 1585, in run
00:33:29.810 ERROR:paramiko.transport: self._handler_table[ptype](self, m)
00:33:29.810 ERROR:paramiko.transport: File "/usr/lib/python2.7/dist-packages/paramiko/transport.py", line 1664, in _negotiate_keys
00:33:29.810 ERROR:paramiko.transport: self._parse_kex_init(m)
00:33:29.810 ERROR:paramiko.transport: File "/usr/lib/python2.7/dist-packages/paramiko/transport.py", line 1779, in _parse_kex_init
00:33:29.810 ERROR:paramiko.transport: raise SSHException('Incompatible ssh peer (no acceptable kex algorithm)')
00:33:29.812 ERROR:paramiko.transport:SSHException: Incompatible ssh peer (no acceptable kex algorithm)
00:33:29.812 ERROR:paramiko.transport:
00:33:29.812 ERROR:root:SSH session connect FAILED for host 172.17.119.187 (Incompatible ssh peer (no acceptable kex algorithm))
00:33:29.824 WARNING:root:SSH command check FAIL for 172.17.119.187
00:33:30.828 INFO:root:Ping OK for: 172.17.119.187

[Ryan Beisner (1chb1n)]

https://github.com/paramiko/paramiko/issues/423

trusty (14.04LTS) (python): Make ssh v2 connections with Python (Python 2)
1.10.1-1git1build1: all
vivid (python): Make ssh v2 connections with Python (Python 2)
1.15.1-1: all
wily (python): Make ssh v2 connections with Python (Python 2)
1.15.2-1: all
xenial (python): Make ssh v2 connections with Python (Python 2)
1.15.3-1: all

[Ryan Beisner (1chb1n)]

ftw:

sudo apt-get install python-ecdsa -y && wget http://ge.archive.ubuntu.com/ubuntu/pool/main/p/paramiko/python-paramiko_1.15.1-1_all.deb && sudo dpkg -i python-paramiko_1.15.1-1_all.deb

[Ryan Beisner (1chb1n)]

paramiko on trusty has known issues with servers running newer sshd versions. We got lucky, and the Wily package installed on trusty with only a little extra work.