HTTP Error 503. The service is unavailable

Posted by user1671639 on Server Fault See other posts from Server Fault or by user1671639
Published on 2013-10-09T11:10:38Z Indexed on 2013/10/30 22:00 UTC
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I'm struggling to setup the environment in IIS8, I searched a lot but couldn't find a right solution.

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I checked the error logs, but no idea.

C:\Windows\System32\LogFiles\HTTPERR

  1. 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
  2. 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

Then in Event Viewer:

WARNINGS:

  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.

I don't understand what the warning means.

ERROR: Application pool 'qa.hti.local' is being automatically disabled due to a series of failures in the process(es) serving that application pool.

Note: I learned that consecutive 5 failures leads to APP Pool crash, and this can increased. I also tried increasing this but no success.

OS: Windows server 2012
IIS Version: 8

Please share your thoughts.

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