From: Essex, England
First, i think you may need to make the UDP send definitions send recieve instead, otherwise the ISA is allowed to send the traffic outbound, but not respond to the incomming connection. Apart from that, the setup looks good.
If that doesnt help though, (and I always suggest this) download bt-patrol from http://www.burstek.com/ptform.htm (fill in the simple form). Load that and it will show you in realtime which packets are being allowed/blocked (check IP packet filter and firewall logs). bt-Patrol will show a spreadsheet type view, with Remote IP, local IP, remote port, local port etc. You will be able to see what ports are being blocked, and create additional filters for them.
Also, I presume you are running UT on a machine behind ISA server, not the ISA server itself? If you are running UT on the ISA server you will have to use packet filters instead (same ports/directions though).
[This message has been edited by Jez (edited 08 November 2001).]