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Unable to connect to AireOS Device with 3.2.0 Release

See original GitHub issue

I am able to connect to device fine using netmiko==3.1.1

>>> from netmiko import ConnectHandler
>>> dev = ConnectHandler(device_type="cisco_wlc", ip=ip, username=username, password=password, port=22, global_delay_factor=1, secret="", verbose=False)
>>> dev.find_prompt()
'(wlc_host)'
>>>

I get a paramiko SSHException when attempting the same thing on netmiko==3.2.0

>>> from netmiko import ConnectHandler
>>> dev = ConnectHandler(device_type="cisco_wlc", ip=ip, username=username, password=password, port=22, global_delay_factor=1, secret="", verbose=False)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/users/user/venv/lib/python3.6/site-packages/netmiko/ssh_dispatcher.py", line 298, in ConnectHandler
    return ConnectionClass(*args, **kwargs)
  File "/home/users/user/venv/lib/python3.6/site-packages/netmiko/base_connection.py", line 341, in __init__
    self._open()
  File "/home/users/user/venv/lib/python3.6/site-packages/netmiko/base_connection.py", line 346, in _open
    self.establish_connection()
  File "/home/users/user/venv/lib/python3.6/site-packages/netmiko/base_connection.py", line 915, in establish_connection
    self.remote_conn_pre.connect(**ssh_connect_params)
  File "/home/users/user/venv/lib/python3.6/site-packages/paramiko/client.py", line 412, in connect
    server_key = t.get_remote_server_key()
  File "/home/users/user/venv/lib/python3.6/site-packages/paramiko/transport.py", line 834, in get_remote_server_key
    raise SSHException("No existing session")
paramiko.ssh_exception.SSHException: No existing session
>>>

I did a pip freeze between 3.1.1 and 3.2.0 and compared and the only difference was netmiko

Issue Analytics

State:
Created 3 years ago
Comments:8 (5 by maintainers)

Top GitHub Comments

1reaction

jmcgill298commented, Aug 24, 2020

@ktbyers I am going to unfollow this issue now that a resolution is decided upon; feel free to close as you wish

1reaction

ktbyerscommented, Aug 24, 2020

Setting conn_timeout argument to 10 fixes this. Per testing by @jmcgill298

So we should put this into the WLC driver.

Also maybe catch the:

    raise SSHException("No existing session")
paramiko.ssh_exception.SSHException: No existing session

And raise a message recommending to increase the conn_timeout

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