Hello, can someone help me understand authentication. I am running the firewall client which sees the ISA server fine, the ISA IP is entered in as the default gateway in the network settings. We are running a Microsoft network with a W2K domain controller. When requesting authentication where is ISA requesting the username and password from ? local accounts? accounts on the domain controller? The ISA is part of the W2K domain but when I request authentication and enter my network username and password, it fails. I have a valid local account on the ISA and within the domain. Any advise? Thanks Bob Garrison, CCNA Jefferson County Library Central Services 3021 High Ridge Blvd High Ridge, MO 63049 636-677-8689