LCS - Windows Messenger port information for IM, File Transfer, Audio and Video

posted by  mneon (8)  12 months ago (blogs.technet.com)

This post is about the ports in use for Windows Messenger and Live Communications Server.

VERY IMPORTANT: only the IM traffic goes through the LCS server, all other traffic is peer to peer.

Firewalls and Windows MessengerOptions exist for using the advanced features of Windows Messenger with a non-UPNP firewall. Points to consider on this topic include:

• Peers on the same side of the firewall can use all of the features of Windows Messenger.
  
• IM and Presence will work through most firewall configurations.
  
• Ports can be opened to allow