title: C# WebProxy not works with https
body: <p>I have Client + Win service.<br>
  Both must work with web server using proxy.<br>
  Without proxy all works fine,<br> 
  With system proxy settings (proxy settings from ie)<br></p>
  
  <pre><code>WebRequest.DefaultWebProxy
  </code></pre>
  
  <p>Client works fine, but service don't see this proxy settings (<code>netsh winhttp set proxy</code> don't help me). So - proxy server works OK<br>
  When I trying to use manual settings:</p>
  
  <pre><code>var_proxy = new WebProxy(Server + ":" + Port, true)
              {Credentials = null};
  var request = (HttpWebRequest)WebRequest.Create(target);
          request.ContentType = Constants.ContentType;   // Default content type
          request.UserAgent = _userAgentHeader;
          request.Method = "POST";
          request.Proxy = _proxy;
  </code></pre>
  
  <p>And as I see in proxy logs - It works with http server, but not used with https! All requests go directly.
  How can I fix it? </p>