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How to establish NetMeeting connections through a firewall ?

MS Netmeeting is a useful chat tool built into Windows. It is also sometimes a useful alternative of Remote desktop to establish a quick connection to a remote computer for general troubleshooting purposes.

To quickly setup NetMeeting, use START > RUN, type: conf.exe

NetMeeting uses the following ports:

Port Purpose
389 Internet Locator Server [Transmission Control Protocol (TCP)]
522 User Location Server (TCP)
1503 T.120 (TCP)
1720 H.323 call setup (TCP)
1731 Audio call control (TCP)
Dynamic H.323 call control (TCP)
Dynamic H.323 streaming [Realtime Transport Protocol (RTP) over User Datagram Protocol (UDP)]

To establish outbound NetMeeting connections through a firewall, it must be configured to do the following:

1. Pass-through primary TCP connections on ports 522, 389, 1503, 1720 and 1731.
2. Pass-through secondary UDP connections on dynamically assigned ports (1024-65535) for audio features.

See also: MS KB 158623

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