I have an annoying issue that I cannot seem to overcome. I realize its more than likely a simple config issue with my LAT...but everything seems right to me at first glance. First off we have ISA Server in a standalone environment. Firewall clients, web proxy clients and Snat clients all work fine with only one issue Firewall Clients and Web Proxy clients when browsing to an IP address are ALWAYS prompted for user credentials (Username/Password/Domain) box within IE. For example Type in http://blah.blah.com = Web page comes up fine However type in http://1.1.1.1 (ip address of blah.blah.com) and you are prompted for credentials to log in. This impacts both local Intranet and external Internet addresses. The lat is setup to include all our internal routable subnets...but I cannot figure out why it does this.