HTTP Error 503.0 - Service Temporarily Unavailable

503 Service Temporarily Unavailable

Most likely causes:

  • An invalid identity in the application pool could cause this error.
  • The application pool is no longer running because of configuration or reaching application failure limits.
  • The concurrent application request limit was reached.
  • Things you can try:

  • Check the event logs and the HTTP error logs for more information.
  • Detailed Error Information:

    Error Code
    Requested URL
    Physical Path
    Logon Method
       Not yet determined
    Logon User
       Not yet determined

    More Information:

    This error occurs when the worker process was unable to start. This could be due to an invalid identity or configuration, or because the concurrent request limit was reached.

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