title: IIS does not accept %3C character (<)
body: <p>A URL like this returns 404:</p>
  
  <p>secure.domain.local:80/PaymentTransaction?ResponseXML=%3c%3fxml+version%3d</p>
  
  <p>But I remove the <code>%3c</code> then it starts working. Of course, it then errors because the data is not being correctly sent.</p>
  
  <p>NOTE: This is an ASP.NET MVC 4 web application.</p>