Hello again,please help! If I change the external IP address of my trihomed ISA server, I loose the connection with external network. Then, with Firewall and Proxy Services stopped, the network is reachable again (with new IP assigned). But, if I start again these services, the network become unreachable again. My external NIC is an Intel PRO/100 VE Desktop (Intel 82801BA controller). Thank you, Teodor Cioboata