Hotmail SMTP with TB

Helo
I have 2 Windows XP SP3 machines setup with Portable TB V2.0.0.23. This includes different Hotmail accounts on the 2 computers.
On one computer I can send mail with the Hotmail SMTP but the other refuses. I set the accounts up in an identical way (except the username and passwords, of course). I setup the Avast virus checkers the same and the firewalls the same.
I checked the Mozilla website: http://kb.mozillazine.org/Connection_errors_-_SMTP and there it states that I have a security issue by specifying SSL, from the error message I get. This is not true because I set up the machines using TSL for SMTP.
What else do I need to check to make both computers work?
Thanks