The server locks down, reporting Event ID 21192 and the error message, "The ISA Server Web filter was unable to connect to MSDE database...."

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Cause: If your server is running Internet Security and Acceleration (ISA) Server, then at midnight ISA Server creates a new MSDE instance to store the next day's logging information for the Web and proxy traffic. If a backup is also a scheduled to begin at midnight, there is a conflict between the ISA Server MSDE instance and the backup process, and this conflict causes the server to lock down.

Solution: To exit the lockdown, restart the Microsoft Firewall service.

To restart the Microsoft Firewall service

  1. Click Start, point to Administrative Tools, and then click Services.

  2. In the list of services, right-click the Microsoft Firewall service, and then click Properties.

  3. Ensure that the Startup type is set to Automatic.

  4. In Services status, click Start, and then click OK.

To prevent this issue in the future, schedule the server backup to start at either 11:30 P.M. or 12:30 A.M. This ensures that there is no conflict between the ISA Server MSDE instance and the backup process.

To modify the Backup schedule settings

  1. Click Start, and then click Server Management.

  2. In the Admin Console, in Standard Management, click Backup.

  3. In the details pane, click Modify the Backup Schedule. The Backup Configuration Wizard starts.

  4. On the Define Backup Schedule page, in the Start Backup at list box, choose either 11:30 P.M. or 12:30 A.M. or later.