##Sorry about that, I had some rich text formatting in the first two messages:## Attached are three files: a server, a client and a ssl certificate Thanks to twisteds remote calls, I can successfully call functions on the server from the client (or send objects if I need to). Fantastic What I can't seem to do, is get the SSL to secure the server from a non-authorised client (one that has access to stunnel.pem). So that if the client does not have the correct certificate it cannot connect to the server. What am I doing wrong? I have adapted some code found here for this example: http://www.lothar.com/tech/papers/PyCon-2003/pb-pycon/pb.html#auto3 Alex Couper