ssh problem

#!/usr/bin/env python
#ssh module
import paramiko

ssh1  = paramiko.SSHClient()
ssh1.set_missing_host_key_policy(paramiko.AutoAddPolicy)
ssh1.connect(hostname = '192.168.2.178', port = 25, username='dokwii', password='okwi1478')
stdin, stdout, sterr = ssh1.exec_command('/sbin/ifconfig')
print stdout.read()
ssh.close()

traceback

 return getattr(self._sock,name)(*args)
socket.error: [Errno 111] Connection refused
Exception AttributeError: "'NoneType' object has no attribute 'print_exc'" in <bound method DevURandomRNG.__del__ of <Crypto.Random.OSRNG.posix.DevURandomRNG object at 0x81c548c>> ignored