title: HttpContext.Current.Request.UserHostAddress is null
body: <ol>
  <li>In my Dev Machine <code>HttpContext.Current.Request.UserHostAddress</code> is null.
  Why? how can I turn it on?</li>
  <li>How can I get list of Ips in case of a proxy client?</li>
  </ol>
  
  <p>WCF Service with ASP.net 4 window7.</p>
  
  <p>Thanks</p>