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Event ID: 23501 Source: MicrosoftFirewall

Writing to the log took approximately 74 seconds. If this time exceeds 30 seconds logging may fail and ISA Server may go into lockdown mode. For more information see Microsoft article 919468 at the ISA Server Help and Support site (

For more information see Help and Support Center at
As the event description says, see ME919468 for methods to prevent ISA Server from enforcing the lockdown mode of operation.

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