Event ID - 21158

Event Id21158
SourcePOP Intrusion Detection Filter
DescriptionThe attempt to write the last date a daily summary was generated failed. A daily summary may be regenerated. Use the source location %2 to report the failure.
Event InformationAccording To Microsoft:
For each daily summary, the last date included in the summary is recorded in the registry. ISA Server was unable to store this information in the registry. As a result, this summary might be generated again. This failure may occur if the registry on the ISA Server computer is corrupted or when there is not enough memory available on the ISA Server computer for the ISA Server Report Generator to write the summary.

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: 21158

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