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SharePoint Web Application stops, HTTP Error 503. The service is unavailable.

February 8, 2012

When you look browse to a SharePoint site (mostly in dev environments) you may see the following error:

Service Unavailable
________________________________________
HTTP Error 503. The service is unavailable.

If you check the Application Pools in IIS, you find that the Application pool is Stopped. Seems to be an easy problem, you start the app pool and reopen the site, but the error remains. When you re-check the AppPool, it is Stopped again.

The following messages are in the Event Log:

ERROR:

Application pool SharePoint Central Administration v4 has been disabled. Windows Process Activation Service (WAS) encountered a failure when it started a worker process to serve the application pool.

WARNING:

Application pool SharePoint Central Administration v4 has been disabled. Windows Process Activation Service (WAS) did not create a worker process to serve the application pool because the application pool identity is invalid.

WARNING:

The identity of application pool SharePoint Central Administration v4 is invalid. The user name or password that is specified for the identity may be incorrect, or the user may not have batch logon rights. If the identity is not corrected, the application pool will be disabled when the application pool receives its first request. If batch logon rights are causing the problem, the identity in the IIS configuration store must be changed after rights have been granted before Windows Process Activation Service (WAS) can retry the logon. If the identity remains invalid after the first request for the application pool is processed, the application pool will be disabled. The data field contains the error number.

Reason

The probably reason for this error is that the password of the application pool identity has been changed, but the old password is not modified in IIS.

Solution

– Open IIS manager
– Select the Application Pool
– Click Advanced settings
– In the Identity field reset the application pool user with retyping its username and password.

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3 Comments
  1. Thanks, worked for me

  2. Did not work for me.

    Naveed Saqib

    • Amit permalink

      I am getting the same error. Application pool’s status is showing the stopped.
      TRied the solution of changing the identity.

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