Actually, www.test.nl resolves to 212.204.218.191, but that's a small matter. ISA doesn't change your previous name resolution. What *can* happen (sounds like your issue) is if your browser is configured to use ISA as a web proxy, then name resolution happens at the ISA, not the client. For details of ISA client behavior, take a read in the ISA help and here: http://isaserver.org/tutorials/ISA_Clients__Part_1__General_ISA_Server_Configuration.html http://isaserver.org/tutorials/ISA_Clients__Part_2_SecureNAT_and_Web_Proxy_Client.html http://isaserver.org/tutorials/ISA_Clients__Part_3_The_Firewall_Client.html All mail to and from this domain is GFI-scanned.