title: NetworkError: 500 Internal Server Error 500 19 183 0
body: <p>We've recently deployed an application to a Windows 2012 R2 Server running IIS8 production box that isn't rendering css or image files up to the browser.</p>
  
  <p>It renders fine in development and validation, however when we put it into production we get an error (Firebug and Fiddler) of:</p>
  
  <pre><code>NetworkError: 500 Internal Server Error - http://website/app/masterpage.css
  </code></pre>
  
  <p>The IIS log entry looks like this:</p>
  
  <pre><code>2015-08-13 18:55:05 172.30.87.77 GET /app/masterpage.css - 80 - 172.25.69.111 Mozilla/5.0+(Windows+NT+6.1;+WOW64;+rv:33.0)+Gecko/20100101+Firefox/33.0 http://website/app/Default.aspx 500 19 183 0
  </code></pre>
  
  <p>I've been searching the web to try and find similar issues and it seems that in order to drill down into this error, I might need to find an HRESULT code, however I cannot determine where this code would be found.</p>
  
  <p>We've looked in the Windows EventViewer, however do not see any 500 Errors there for IIS and cannot see any HRESULT codes in Fiddler or Firebug.</p>
  
  <p>I guess the other option would be to turn on FailedRequestTracing in IIS 8</p>
  
  <p>Thanks for any guidance on this issue.</p>