title: TFS 2013 Build machine lost connectivity to message queue
body: <p>TFS build controller is outputting the following error message when starting up:</p>
  
  <pre><code>Build machine [BuildServerName] lost connectivity to message queue tfsmq://buildservicehost-5/.
  Reason: Please contact your administrator. There was an error contacting the server.
  Technical information (for administrator):
    HTTP code 500: System.ServiceModel.ServiceActivationException
  </code></pre>
  
  <p>I've tried recreating the build controller and re-registering the build service.</p>
  
  <p>Does anyone know how I can troubleshoot the tfsmq or have an existing solution to the error I'm receiving? Any help at all would be greatly appreciated.</p>
  
  <p>Thanks.</p>