title: Changed domain error - OpenId auth request contains an unregistered domain
body: <p>I set up a project on my main domain example.com and then moved it to a subdomain sub.example.com</p>
  
  <p>Now when I try to use the same (default ASP.NET MVC or on my Discourse forum) project with OpenId and click on the Google button to log in with my Google account it throws the following error - </p>
  
  <ol>
  <li><p>That’s an error.</p>
  
  <p><code>OpenID auth request contains an unregistered domain: http://sub.example.com</code></p></li>
  </ol>
  
  <p>I have tried Googling that message but apparently I am one of the first four people to see it.  Any ideas here?</p>