OK, I have done some checking and established that my ISA server is using the WRONG IP for outgoing traffic defined by protocol rules. My external Nic is configured: MAIN tab: 203.110.145.178 255.255.255.240 ADVANCED tab: 203.110.145.179 255.255.255.240 203.110.145.180 255.255.255.240 203.110.145.181 255.255.255.240 When I check the outgoing traffic on my boundary router all the packets that come from protocol rules (where I dont have the opportunity to specify an outgoing IP to use) come from 203.110.145.179. So it seems as though ISA regards this as the default? Questions: 1. Why doesnt ISA regard the IP on the MAIN tab of the inteface config as the default? 2. How can I make it use the correct IP as the default? ------------------------------------------------------------------------ Al Blake ICT Manager, Canberra Girls Grammar School Melbourne Avenue, Deakin, ACT 2600, Australia. Switch: +61 2 62026400 Direct: +61 2 62026448 Mobile: +61 408 296 381 Fax: +61 2 62731505 ------------------------------------------------------------------------