title: HTTP Error 503. The service is unavailable
body: <p>I'm struggling to setup the environment in IIS8, I searched a lot but couldn't find a right solution.  </p>
  
  <p><img src="https://i.stack.imgur.com/Zy2Fk.png" alt="enter image description here"></p>
  
  <p>I checked the error logs, but no idea. </p>
  
  <blockquote>
    <p><strong>C:\Windows\System32\LogFiles\HTTPERR</strong></p>
    
    <ol>
    <li>2013-10-09 09:28:39 192.168.43.205 60172 192.168.43.205 80 HTTP/1.1
    GET / 503 2 AppOffline qa.hti.local</li>
    <li>2013-10-09 09:28:39 192.168.43.205 60192 192.168.43.205 80 HTTP/1.1
    GET /favicon.ico 503 2 AppOffline qa.hti.local</li>
    </ol>
  </blockquote>
  
  <p>Then in <strong>Event Viewer:</strong></p>
  
  <blockquote>
    <p><strong>WARNINGS:</strong></p>
    
    <ol>
    <li>A listener channel for protocol 'http' in worker process '11188'
    serving application pool 'qa.hti.local' reported a listener channel
    failure.  The data field contains the error number.</li>
    <li>A listener channel for protocol 'http' in worker process '7492'
    serving application pool 'qa.hti.local' reported a listener channel
    failure.  The data field contains the error number.</li>
    <li>A listener channel for protocol 'http' in worker process '9088'
    serving application pool 'qa.hti.local' reported a listener channel
    failure.  The data field contains the error number.</li>
    <li>A listener channel for protocol 'http' in worker process '9964'
    serving application pool 'qa.hti.local' reported a listener channel
    failure.  The data field contains the error number.</li>
    <li>A listener channel for protocol 'http' in worker process '7716'
    serving application pool 'qa.hti.local' reported a listener channel
    failure.  The data field contains the error number.</li>
    </ol>
  </blockquote>
  
  <p>I don't understand what the warning means.</p>
  
  <blockquote>
    <p><strong>ERROR:</strong> Application pool 'qa.hti.local' is being automatically disabled due to a series of failures in the process(es) serving that
    application pool.</p>
  </blockquote>
  
  <p><strong>Note:</strong> I learned that consecutive 5 failures leads to APP Pool crash, and this can increased.  I also tried increasing this but no success.</p>
  
  <p>Please share your thoughts.</p>