[paramiko] no existing session

[Chris Hallman]

I'm trying to write a program that connects to a Cisco router to run
multiple commands and collect data. I've tried the following:

import socket
import paramiko

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((''rtr3926', 22))

trans = paramiko.Transport(sock)
trans.auth_password('user', 'password')

and I receive this error:

>pythonw -u "paramiko.test.py"
Traceback (most recent call last):
  File " paramiko.test.py", line 10, in <module>
    trans.auth_password('####', '####')
  File "c:\python25\Lib\site-packages
\paramiko\transport.py", line 1096, in auth_password
    raise SSHException('No existing session')
paramiko.SSHException: No existing session
>Exit code: 1

Any ideas why I'm receiving this error?
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