title: Unable to connect through browser window
body: <p>I deleted the firewall rule <code>default-allow-ssh</code> and now I cannot SSH via browser window even after adding back the same rule:</p>
  
  <p><a href="https://i.stack.imgur.com/E7CaS.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/E7CaS.png" alt="enter image description here"></a></p>
  
  <p>I have gone through the check list <a href="https://cloud.google.com/compute/docs/ssh-in-browser#ssherror" rel="nofollow noreferrer">here</a>, but still can't figure out the cause. The problem is happening to existing instances as well as a newly created Ubuntu f1.micro instance which has all the Google defaults.</p>
  
  <p>What could be wrong?</p>