behind my ISA 2006 EE, I have two radius proxy server. I have create an access rules to allow this two servers to going out with Radius Protocol (udp 1812, 1813, 1645, 1646). If I keep only this ports, radius communication doesn't work. If I change my rules to allow all protocols, radius communication works as fine. I don't see any dropped packet in the logs so I don't understand the problem.