I'm having the same error above, but with this in front of it:
2017-10-13 20:43:11,150 dxlclient.broker - ERROR - Socket could not be created. Error Code : None Message timed out
2017-10-13 20:43:11,206 dxlclient.broker - ERROR - Socket could not be created. Error Code : None Message timed out
I have added the certificate to the Topic Authorizations as well.