code: public void restartListener(String _url) {
      if (getConfig().setListenerURL(_url)) {
        if (_server != null)
          _server.shutdownNow();
        try {
          startListener();
        } catch (IOException | URISyntaxException e) {
          Console.severe("Unable to start services.");
          e.printStackTrace();
        }
      }
    }
docs: This will restart the embedded HTTP(S) Grizzly server that acts as the
  listener for the Probe responses.
  
  @param _url the new URL for the listener to use