title: Can't enable http traffic on instance
body: <p>When I use <a href="https://github.com/GoogleCloudPlatform/bdutil/blob/master/platforms/hdp/README.md" rel="noreferrer">these instructions</a> to create a Hadoop cluster, "Allow http traffic" is grayed out in the console, which prevents me from accessing Ambari. Is there any way I can enable it?</p>
  
  <p><a href="https://i.stack.imgur.com/ReId2.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/ReId2.jpg" alt="screenshot"></a></p>