title: Cannot connect to Google Datalab notebook
body: <p>I am using windows 10 and Chrome.  After creating a Datalab VM, I clicked on Preview at port 8081.  In the new browser instance, I clicked on add a new notebook.  It opens the notebook, but gives the following error</p>
  
  <p>A connection to the notebook server could not be established. The notebook will continue trying to reconnect. Check your network connection or notebook server configuration.</p>
  
  <p>Since the connection has failed, nothing works.  How to get the connection?  How to check the notebook server configuration?</p>