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Event ID: 15002 Source: MicrosoftISAServerControl

ISA Server detected an Internet Protocol (IP) half scan attack. For more information about this event, see ISA Server Help. For more information about this event, see ISA Server Help.
As per Microsoft:
Explanation: An Internet Protocol (IP) half scan attack was attempted against a computer protected by ISA Server. This alert occurs when an unexpected Transmission Control Protocol (TCP) packet with a particular flag (for example, Fin, Ack, All, None) is detected.
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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