Yes, there is no one set definition for MSN messenger.
If you are looking to control or block access for MSN your best bet is to use the IM/P2P filtering section.
Otherwise if you are looking to control certain aspects of the MSN messenger protocol such as file transfers or desktop sharing microsoft has this list:
The following table lists the network ports that are required for various features of Windows Live Messenger 8.1 on a Windows Vista-based computer.
Feature Port that is used
Sign in to the Messenger service TCP 80, 443, 1863
Network Detection TCP 7001
UDP 9, 7001
Audio TCP 80, 443, 1863
TCP/UDP 30000 - 65535
Audio (Legacy) * UDP 5004 – 65535
Webcam and Video Conversations TCP 80
TCP/UDP 5000 - 65535
File Transfer TCP 443, 1863
TCP/UDP 1025 - 65535
File Transfer (Legacy) * TCP 6891 - 6900
Sharing Folders TCP 1863
TCP/UDP 1025 – 65535
Whiteboard and Application Sharing TCP 1503
Remote Assistance TCP 3389
TCP/UDP 49152 – 65535
Windows Live Call TCP 443, 5061
UDP 5004 - 65525
Games TCP 80, 443, 1863
TCP/UDP 1025 - 65535
* These ports are used when you are connected to a contact through a legacy client program, such as MSN Messenger 5.0 or any version of Windows Messenger.
URLs
The following table lists the URLs to which Windows Live Messenger connects.
URL used URL function
https://Login.live.com (https://Login.live.com) HTTP over SSL (HTTPS) authentication to Windows Live ID and acquiring of x509 certificates for secure peer-to-peer (p2p) connections for the Sharing Folders feature
https://*.storage.msn.com (https://*.storage.msn.com) Storage of the user tile,
personal status message, and display name for a user so that the user can have the same set of information across all Windows Live experiences on work and home computers; (Simple Object Access Protocol [SOAP] over HTTPS)
http://*.edge.messenger.live.com (http://*.edge.messenger.live.com) Various core Messenger operations. For example, echo servers that are used to establish direct connectivity between two messenger clients for peer-to-peer (p2p) communication when clients are behind firewalls
http://rad.msn.com (http://rad.msn.com) To download advertising content display in the client and to download ad-sponsored personal expression content, such as display pictures, and emoticons
Thanks Cath. Most modern IM apps use whatever port they find is open. We do have some definitions for services that usually stick to their default ports, but MSN is not among them.
Thanks Cath. Most modern IM apps use whatever port they find is open. We do have some definitions for services that usually stick to their default ports, but MSN is not among them.