title: Mvc returns 403.14 instead of 404 from "hidden" folders
body: <p>We have a standard MVC4 web application, however the application has access to very confidential client data and so recently a 3rd party performed a security review.</p>
  
  <p>Not a problem, we passed without any major issues however they pointed out we have a number of "Hidden Directories" which they have recommended we should return a status code 404 and not 403.14 (forbidden)</p>
  
  <p>One of the folders is the default "Content" directory which contains images and other assets. </p>
  
  <p>My question is how do I go about returning a 404 when /Content is requested?</p>
  
  <p>Is this an IIS config or do I need to write something custom in the Mvc layer?</p>