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Event ID: 15001 Source: MicrosoftISAServerControl

Level
Description
ISA Server detected a windows out-of-band attack. For more information about this event, see ISA Server Help.
Comments
 
As per 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, which is located under the ISA Server installation folder. You can use this log to monitor any further intruder activity. Steps against intruder activity might include setting up a packet filter or policy rules to inhibit traffic from the source of the intrusion.

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