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Bug 1405220

Summary: Connection to openssh >= 6.7 not possible
Product: Red Hat Enterprise Linux 6 Reporter: Gerald Prock <gerald.prock>
Component: python-paramikoAssignee: Python Maintainers <python-maint>
Status: CLOSED WONTFIX QA Contact: BaseOS QE Security Team <qe-baseos-security>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 6.9CC: ben.harper, carlwgeorge, cstratak, hhorak, torsava
Target Milestone: rcKeywords: Rebase
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Hardware: Unspecified   
OS: Unspecified   
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Clone Of: Environment:
Last Closed: 2017-06-30 07:55:51 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description Gerald Prock 2016-12-15 21:47:38 UTC 
Description of problem:
The connection from EL6 to a openssh server with version 6.7 or higher is not possible (Also EL7 is effected). A sample for a target server is VMware6 or Debian8.


How reproducible:
The connection could not be established and fails with the following error:
paramiko.SSHException: Incompatible ssh peer (no acceptable kex algorithm)


Steps to Reproduce:
[root@test log]# python
Python 2.6.6 (r266:84292, Aug  9 2016, 06:11:56) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import paramiko
>>> ssh = paramiko.SSHClient()
>>> ssh.connect('10.10.123.123',username='root',password='xxxxx')
No handlers could be found for logger "paramiko.transport"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/site-packages/paramiko/client.py", line 295, in connect
    t.start_client()
  File "/usr/lib/python2.6/site-packages/paramiko/transport.py", line 451, in start_client
    raise e
paramiko.SSHException: Incompatible ssh peer (no acceptable kex algorithm)
>>> 


Additional info:
Problem is fixed in paramiko 1.15.1
https://github.com/paramiko/paramiko/issues/423
Comment 2 Gerald Prock 2017-03-22 12:08:52 UTC 
We solved the problem with rewriting the scripts to normal SCP.
Not nice but permanent working ...

For me the ticket can be closed with "will not fix".
Comment 3 Honza Horak 2017-06-30 07:55:51 UTC 
Closing as per comment #2.