Event ID - 21153

Event Id21153
SourceDNS Intrusion Detection Filter
DescriptionISA Server report or summary generation error: The daily summaries needed for report or summary generation were generated with a previous version of the product (%1). These daily summaries will not be included in any reports or summaries. Please use the source location %2 to report the failure
Event Information According to Microsoft :
CAUSE :
Some summary files needed to generate the report were generated with a previous version of the product.

SOLUTION :
Delete these log summary files and then regenerate the report
Reference LinksEvent ID: 21153 Of Source ID:DNS Intrusion Detection Filter

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