title: HTTP 500 error when user not logged into Facebook on a Windows Phone 7
body: <p>I've set up my Silverlight WP7 app to use a WebBrowser Control to allow users to log into facebook and grant permissions for further actions.  After the user has granted permissions, they are redirected to a web page letting them know permissions have been granted.</p>
  
  <p>The chain is as follows: </p>
  
  <blockquote>
    <p>App -> opens WebBrowser control at web service #1 -> web service redirects to FB -> Permissions granted -> FB redirects to web service #2 which returns a view.</p>
  </blockquote>
  
  <p>Web services are both within an externally hosted MVC project.</p>
  
  <p>This all works fine, UNLESS the user is not logged into facebook - instead of taking them to the facebook login page as you would expect, I just get an HTTP 500 internal server error and web service #2 is not hit.  If the user is logged in, then everything proceeds as it should.</p>
  
  <p>I'll also mention this ONLY happens on the WP7 device and does not occur in any browser, including IE9, on my laptop.    </p>
  
  <p><strong>EDIT</strong>: For clarity's sake, Web browsers on my laptop were tested by setting a breakpoint before my WebBrowser control was called in Visual Studio, I grabbed the Uri I had built there, and pasted it into Chrome, IE9 etc.</p>
  
  <p>I'm not even sure what direction to look in! Also, I'm sure you guys may need more details to aid you with this question - please let me know what else it is you might need and i'll do my best to provide it.</p>