title: Native Postman returns 503 when posting to localhost but Chrome Postman extension works
body: <p>I am trying to post simple Get commands to my service running on localhost using the Windows native Postman application (V4.8.0) but they fail. The Postman Console shows</p>
  
  <blockquote>
    <p>Error: tunneling socket could not be established, statusCode=503</p>
  </blockquote>
  
  <p>An example of the Get command is the following request for simple status message.</p>
  
  <pre><code>https://localhost/api/admin/status
  </code></pre>
  
  <p>The same commands work when directed to the identical service running on an external server.
  They also work posting to localhost directly from Chrome and when using the Chrome Postman extension (also V4.8.0).</p>
  
  <p>SSL certificate verification is turned off.</p>