I have an ASP.NET (Visual Studio 2003) application that uses windows authentication. IIS is running on our company Intranet server which runs Windows Server 2003 and IIS 6. We also use Active Directory. When you open the start page it prompts you to login using the same information you already used to get logged on to the network. Since the user is already “in”, how can I prevent the IIS server from prompting for their credentials again?