title: HttpContext.Current.User.Identity.IsAuthenticated returns false
body: <p>I have a strange issue.</p>
  
  <p>I have a page with the following code.</p>
  
  <pre><code>if (!HttpContext.Current.User.Identity.IsAuthenticated)
      {
          Server.Transfer(@"~/Views/Public/Unauthorised.aspx");
          return;
      }
  </code></pre>
  
  <p>For some reason, with one user (and we've narrowed it down to his single machine and windows logon profile), <code>IsAuthenticated</code> always returns false. Even though he is logged into the website, and can navigate to other pages that require authenticated user. Except this one page.</p>
  
  <p>We checked that the machine accepts all cookies and we still get the same issue. I'm not sure where to go from here... any suggestions?</p>