title: User.Identity.Name blank in ASP.Net MVC
body: <p>Exactly as per the title.</p>
  
  <p>Simply in my HomeController I have:</p>
  
  <pre><code>string Username = User.Identity.Name;
  </code></pre>
  
  <p>Why is this value always blank?</p>
  
  <p>Is there something special I have to place in the web.config to get this value to come through. I've tried on both the VS dev web server as well as on a windows server 2003 IIS server.</p>
  
  <p>It's got to be something simple, a server setting in IIS or something as the code is so simple and seems to be the correct way to reference this value.</p>
  
  <p>Thx a lot</p>