title: HttpContext.Current.User.Identity.Name is Empty
body: <p>I have a Silverlight application (using MVC) and when i'm building in visual studio, using Visual Studio Development center, there's no problem, the <code>HttpContext.Current.User.Identity.Name</code> has a Value</p>
  
  <p>But when i'm using the same project with IIS 7.5 (i'm using Windows 7), <code>HttpContext.Current.User.Identity.Name</code> stays empty</p>
  
  <p>Anyone who can help? Or knows where i can find the settings from the visual studio Development center, so i can check what's wrong in IIS?</p>