Thursday, 15 April 2010

The identity of the Application Pool is invalid

You're getting an invalid application pool identity error, but you are 100% certain you have entered the username and password correctly. And, of course, in some cases, you made a typo and gone back to correct it, but in those very few instances the following error is found in the eventlog:

“The identity of application pool ‘DefaultAppPool’ is invalid, so the World Wide Web Publishing Service can not create a worker process to serve the application pool. Therefore, the application pool has been disabled.”

In this case the application pool identity is in fact correct, but the user ID in the app pool is not part of the IIS_WPG on the web server. Only users in this group may start worker processes.  Add the user and recycle the application pool. Voila!

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