SOCKET ERROR: [Errno 111] Connection refused on Ubuntu

问题

Traceback (most recent call last):
   s = smtplib.SMTP('localhost')
  File "/usr/lib/python2.7/smtplib.py", line 251, in __init__
    (code, msg) = self.connect(host, port)
  File "/usr/lib/python2.7/smtplib.py", line 311, in connect
    self.sock = self._get_socket(host, port, self.timeout)
  File "/usr/lib/python2.7/smtplib.py", line 286, in _get_socket
    return socket.create_connection((host, port), timeout)
  File "/usr/lib/python2.7/socket.py", line 571, in create_connection
    raise err
socket.error: [Errno 111] Connection refused

Q: I am getting this error on my ubuntu machine. Question is why so? The reason being when I execute the same code on Mac OS X 10.7 I don't see this error. And I did not do any special configuration on Mac for this to work.

回答1:

Make sure that your system is running smtp server:

netstat -nlt | grep '\<25\>'

If your system is running the smtp server, the above command will show somehting like this:

tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN     

来源：https://stackoverflow.com/questions/31716349/socket-error-errno-111-connection-refused-on-ubuntu