Event ID - 15101

Event Id15101
SourceMicrosoft ISA Server Control
DescriptionISA Server detected a windows out-of-band attack from Internet Protocol (IP) address %1. For more information about this event, see ISA Server Help.
Event InformationAccording to Microsoft:
EXPLANATION:
A windows out-of-band denial-of-service attack was attempted against a computer protected by ISA Server. If successful, this attack crashes the computer.
USER ACTION:
If logging for dropped packets has been set, you can view details of this attack in the packet filter log in the ISALogs folder, which is located under the ISA Server installation folder. You can use this log to monitor intruder activity. Steps against intruder activity include setting up a packet filter or policy rules to inhibit traffic from the source of the intrusion.
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