Event ID - 21145

Event Id21145
SourceMicrosoft ISA Server Report Generator
DescriptionMicrosoft ISA Server SMTP Message Screener failed to start.
Reason: The SMTP Message Screener could not create the activity logger object (error code %1).
Event InformationAccording to Microsoft

Cause:
The ISA Server SMTP Message Screener could not create its logging module.
Resolution:
Check the validity of the ISA Server SMTP Message Screener configuration. Free up memory. Close other programs that are running. Use the Task Manager to check programs and processes that are using large amounts of system resources.Restart the service hosting the message screener sink filter.Reinstall the message screener filter.
Reference LinksEvent Id:21145 Source Id:Microsoft ISA Server Report Generator

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