In configuring communication between our MS Proxy/ISA 'Firewall Clients' and the ISA 2000 Server (through/across our Cisco LocalDirector box (like a network firewall)), we are trying to determine what TCP and UDP ports need to be allowed pass-through access. TechNet doesn't provide any information on this. Various NetMon traces and NetStat captures reveal either conflicting or wide-ranging results. We're pretty sure about TCP port 1745 and UDP port 1745. Others? TIA, Chris