Paramiko "Unknown Server"

Question

I'm trying to get started with the Paramiko library, but the library is throwing an exception as soon as I try to connect with the following simple program:

import paramiko
ssh = paramiko.SSHClient()
ssh.connect('127.0.0.1', username='boatzart', password='mypassword')

The error I get is:

Traceback (most recent call last):
File "test.py", line 6, in <module>
ssh.connect('127.0.0.1')
File "build/bdist.macosx-10.7-intel/egg/paramiko/client.py", line 316, in connect
File "build/bdist.macosx-10.7-intel/egg/paramiko/client.py", line 85, in missing_host_key
paramiko.SSHException: Unknown server 127.0.0.1

This occurs no matter which server I try.

Answer 1

I experienced the same issue and here's the solution that worked out for me:

import paramiko

client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect('127.0.0.1', username=username, password=password)
stdin, stdout, stderr = client.exec_command('ls -l')

This is to set the policy to use when connecting to a server that doesn't have a host key in either the system or local HostKeys objects. The default policy is to reject all unknown servers (using RejectPolicy). You may substitute AutoAddPolicy or write your own policy class.

More details at paramiko api doc. Hope this helps.