Windows Messenger ports for IM, Voice, Video and File Transfer
August 31, 2005 at 8:22 AM
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2102
SUMMARY
When you use the advanced features of Microsoft Windows Messenger together with a firewall that is not a UPnP firewall, you should consider the following points:
- Peers that are on the same side of the firewall can use all the features of Windows Messenger.
- Instant messaging (IM) and presence information work through most firewall configurations.
- Ports can be opened to enable the peer-to-peer protocol to function through a firewall.
- Port ranges can be set to fixed ranges by using Group Policy.
Important: Only the IM traffic goes through the server that is running Microsoft Office Live Communications Server 2005. All other traffic goes through a peer-to-peer network.
This article introduces the basic protocol port usage for the Windows Messenger client that is used in the Microsoft Office Live Communications Server 2005 Enterprise Edition scenarios.
KB903056 - Description of the Windows Messenger client basic protocol port usage for instant messaging, file transfer, audio, and video