The site is running on my local IIS 6.1. I Would like to add some features to pull information from our AD. My AD code works on many other projects and on my dev server. Her
There are two different windows user here - first one is your application user and second is user (or windows account) under which your ASP.NET application (application pool from IIS perspective) is running. WindowsIdentity.GetCurrent will typically return this reference.
To getting actual windows user that using the application, you must enforce authentication. To do that, you can enable integrated authentication (windows authentication) in IIS for the said web site. Also modify your ASP.NET configuration to use windows authentication. Now you can use HttpContext.Current.User.Identity to get the actual user.