Using a firewall to connect to .NET Messenger Service
||Solve a Messenger problem
Solve ID: 16
Click Start, then click the Control Panel.
If you're in category view click Network and Internet connections then click Network Connections.
Right click your connection, then click Properties. For cable modem users, your connection will usually be called Local Area Conneciton. For dialup, it should be the name of your Internet Service Provider.
Click the Advanced Tab, verify the Internet Connection Firewall is turned on. Then click the Settings tab.
Click the add button.
In the Service Settings, type in the following information (use the screenshot above for assistance). For Description enter MSN Connection for Name or IP address enter 127.0.0.1, for both External and Internal ports enter 1863. Verify TCP is selected and click OK.
Now you need to repeat the last step but changing the ports to 5060, 1503, 3389, 6891, 6892, 6893, 6894, 6895, 6896, 6897, 6898, 6899, 6900. Yes, 14 (including the first one) will now be selected. Make sure all 14 connections are selected then click OK.
This should solve your problem. Return to the list of problems.