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Custom App Pool using an AD user id and the /3GB switch

By Steve Schofield

The article covers an issue I discovered when troubleshooting why application pools kept getting Service Unavailable errors while running as a Custom Application Pool user.  Google and Support.microsoft.com have several articles covering what this error but didn't explain the issue I ran into..  By default, application pools use 'NETWORK SERVICE' as the user id on all application pools.  This is a built-in account provided by Windows.   In a shared hosting environment, this can provide a security risk.  The environment I'm experiencing this issue on is a webfarm.  To help keep the administration at the minimum, we use an Active Directory (AD) user as the application user.  The AD user is a member of a global group that all application pool users are a member of.  This group is added to the local machines IIS_WPG group.  In-order to run application pools, a user has to be a member of this special local group.  Here is more info on this topic 

 

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