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Windows Messenger and Smoothwall

Hi
I wonder if anyone can help me reolve the following problem. I have two computers running xp that access the internet via a smoothwall box. I now need to use the windows messanger program with a webcam but have found that I can only get it to work with the computers behind the firewall. I seem to be able to get it to work with text but not with the cam. I am fairly sure it is a security feature within smoothwall but do not know where to look to get messenger to work. Has anyone else experienced this or know how to resolve this.
kind regards
Pete

IIRC voice etc use different ports from the "usual" stuff.
Did you Google the net for the ports? Did you try logging DROPped packets on the fw?

Code:

Feature Outbound  Port Inbound Port

Text chatting 80 (TCP) 80 (TCP

Voice– PC to PC 6901 (TCP/UDP) 6901 (TCP/UDP

Voice– PC to Phone 6801 (UDP) 6901 (TCP/UDP

              2001-2120 (UDP – dynamic) 6801 (UDP)

              6901 (TCP/UDP) 2001-2120 (UDP – dynamic

              7801-7825 (TCP – dynamic

File Transfer 6891-6900 (TCP – dynamic) 6891-6900 (TCP – dynamic)

MSN Messenger Service 1863 (TCP) 80 (TCP)80 (TCP)