After remove and reinstall of ISA server (due to hardware problem on the outbound network card), I could not even get the most simple part to work with ISA server (simple internet access from a internal network client!!!) I got the above error message from the browser. I have check ipconfig /all I have check all possible rules and protocol and filter setting. ( I haven't start anything like OWA or VPN set up yet! ) I check and reboot all necessary related servers and no error message. Can ping out side world from isa server command prompt. Simple network architecture: One DC computer One separate stand alone ISA installation Any suggestion?? Many thanks