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Event ID: 203 Source: ESE

<process> (<PID>) The database engine has stopped the backup with error <error code>.
- Error code: -521 - From a newsgroup post: "Some backup application attempted and failed to backup the system state. Error -521 is errInvalidBackupSequence, meaning that the backup application made calls out of order. Further, it failed to handle the error and abandoned the backup attempt instead of aborting it. As far as AD can tell the backup is still underway, and logging must be done in sequential (not circular) mode until the backup is complete. Rebooting will clear the bogus backup state, but I would encourage you to find out which backup application caused the problem, report it to the vendor and avoid running it again without fixing it first". See the link to "Google thread - Event ID 203 On DC" for the original thread.

See MSEX2K3DB for more details on this issue.

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