The following question was recently asked on the NG:
“Does anybody know how to allow the Video/Audio in MSN6.2 through ISA firewall. I have tested it OK between 2 laptops over the internet, but when I return one back to our SBS2003 LAN and try a video conf, I get the message: Your computer, Internet provider or network may not support audio conversations or video conversations.
Any Ideas ?????
Steve Foster replied as follows:
You will not get MSN Messenger video/audio to work through ISA. I don’t think ISA2004 will support it either.
The problem is that the audio/video connections are built dynamically, on random ports, directly between the two ends of the IM conversation, without going through the MSN IM servers. Both ends need to allow incoming connections on those random ports.
Many firewalls don’t support MSN Messenger audio/video.
This is one of the [self-inflicted] problems where uPnP helps (as it allows the client to reconfigure the firewall on demand). Personally, I don’t want my firewalls dynamically reconfigured, thank you very much…
Steve Foster [SBS MVP]