Im having exactly the same problem, and I have tryed all the resolutions stated on microsofts site but nothing seemed to help. When I attempt to access any secure site, it just purely states that the "connection was refused when contacting. . . . ". Also on MSN Messenger it says I have a problem with the same thing.
If any one has sorted this problem out I would really appreciate it if you could share how you done it with us. Thanks In Advance!!:-D