Can't connect to Interactive Brokers with python

Question

I want to connect to IB with python, here is my code:

from ib.ext.Contract import Contract
from ib.ext.Order import Order
from ib.opt import Connection, message


def error_handler(msg):

   print "Server Error: %s" % msg

def reply_handler(msg):

   print "Server Response: %s, %s" % (msg.typeName, msg)



if __name__ == "__main__":
 tws_conn = Connection.create(port=7496, clientId=100)
 tws_conn.connect()
 tws_conn.register(error_handler, 'Error')  
 tws_conn.registerAll(reply_handler)

Whenever I use this code I receive this error which indicates that I can't connect to server:

Server Error: <error id=-1, errorCode=504, errorMsg=Not connected>
Server Response: error, <error id=-1, errorCode=504, errorMsg=Not connected>

Why I can't connect to IB?

Answer 1

Three things:

1. Make sure the TWS java app is running and you are logged in.
2. In TWS, go to Global Configuration > API, and make sure "Enable Active and Socket Clients" is checked.
3. In Global Configuration > API, make sure you add "127.0.0.1" as a Trusted IP Address (this assumes your py code is running on the same machine that is running the TWS java app.