title: google hangout microphone is not working with network error and firewall setting issue
body: <p>From last 1 week i am facing strange issue in google hangout. as i join a meeting first a message pops up</p>
  
  <p>Your microphone is not working or is hardware-muted!</p>
  
  <p>then after few seconds i see message </p>
  
  <p>Couldn't start the video call because of a network error.
  Please check your firewall settings and try again.</p>
  
  <p>with button to try again. and it keeps going on in this way. </p>
  
  <p>I have checked firewall settings
  I have tried with different networks
  I have tried with different computers
  I have tested microphone and speakers they are correct </p>
  
  <p>I inspected ajax calls in firebug and i see this</p>
  
  <p>NetworkError: 404 Not Found - <a href="https://plus.google.com/u/0/talkgadget/_/ping?id=1">https://plus.google.com/u/0/talkgadget/_/ping?id=1</a></p>
  
  <p>NetworkError: 404 Not Found - <a href="https://plus.google.com/u/0/talkgadget/_/ping?id=2">https://plus.google.com/u/0/talkgadget/_/ping?id=2</a></p>
  
  <p>POST <a href="https://plus.google.com/hangouts/_/channel/bind?...200F2A8A372&amp;RID=67018&amp;AID=84&amp;zx=2a53yvv7e45w&amp;t=1">https://plus.google.com/hangouts/_/channel/bind?...200F2A8A372&amp;RID=67018&amp;AID=84&amp;zx=2a53yvv7e45w&amp;t=1</a> Aborted</p>