Msn Messenger Connection Settings

[Legnome]

I need to set up a messenger, (does not need to be MSn Msgr), connection to MSN Messenger service.

Hardware: iMac G5
OS: 10.3.9

We are firewalled.

Yahoo Messenger works via proxy server.

I've tried:

MSN 4.0.1 (040922)
aMSN 0.94
Adium X 0.82

all fail to connect.

Any suggestions?

Tnx.

Tom