What are key ports in a MSN messenger test?

What are key ports in a MSN messenger test?

Using XP Home, the Presario will connect in SAFE Mode but not in normal
mode.
using a Bell South Westell Modem.
Connected direct to the NIC card.
No router, hub or wireless.

The BellSouth DSL stopped working last night. Opened Control Panel.
Network and Internet Connections.

scan your system
[00000001] VIA Rhine II Fast Ethernet Adapter (FAILED)
IPAddress = 192.168.1.97 (FAILED)
Pinging 192.168.1.97 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 192.168.1.97:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss)

Clicked signin with MSN Messenger
Failed
Messenger has a diag / test option
It failed on; key ports

What are key ports in a MSN messenger test?

Completed all the default installs in the web browser;
http://launchmodem/installBS.htm

Receive a confirmation success message;
http://launchmodem/installCompleteBS.htm