Event ID - 21157

Event Id21157
SourcePOP Intrusion Detection Filter
DescriptionThe attempt to write to the registry the last date on which a monthly summary was generated failed. Use the source location %2 to report the failure.
Event InformationAccording To Microsoft:
The ISA Server Report Generator failed to write the last date on which a monthly summary was generated to the registry. As a result, the next time summaries are created, the ISA Server Report Generator will try to recreate one or more of the summaries. This failure may occur when the registry on the ISA Server computer is corrupted or there is not enough memory available on the ISA Server computer for the ISA Server Report Generator to complete the action.

View the result code for details about the source of the error. Free memory resources. Close other programs that are running. Use the Task Manager to check programs and processes that are using large amounts of system resources.Try to restore the most recent registry backup.Try reinstalling ISA Server (choose the Repair option in Setup).
Reference LinksMicrosoft product: Internet Security and Acceleration Server Version: 4.0.3443.594 Event Source: POP Intrusion Detection Filter Event ID: 21157

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