title: Weird Varnish 503 error - what does this mean?
body: <p>My online whiteboard application has been working previously, but for whatever reason, it no longer works. Now it shows a 503 Varnish cache error as seen here: <a href="http://grab.by/eFHG">http://grab.by/eFHG</a></p>
  
  <p>Do you happen to know where I should start to look to try to resolve this issue?</p>
  
  <p>Thanks!
  Donny</p>