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Event ID: 1057 Source: W3SVC

Source
Level
Description
The identity of application pool '<pool>' 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.
Comments
 
This was a SharePoint problem for us. If you go to your IIS on the server in question under application pools and find the site in question, go to Properties, then the Identity tab, to the place where you can change the user/password. We had recently changed the service account password, but did not know we needed to change it here as well. Once we did that things started working again.
This problem occurs if the Net Logon service on the domain controller does not start before the World Wide Web Publishing Service starts. See ME929100 for a workaround.

This issue occurs if the password of the Communicator Web Access service account has changed or has expired. Therefore, the Communicator Web Access service uses an incorrect password to try to start. See ME931507 to solve this problem.
From a newsgroup post: "I seem to have resolved the issue by recreating the application pool account (delete / recreate)".

See "Configuring and Troubleshooting Windows 2000 and Windows Server 2003 Certificate Services Web Enrollment" for details on this event.

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