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Event ID: 15105 Source: MicrosoftISAServerControl

ISA Server detected generic port scan attack from IP address <ip address> More details of this event can be found in ISA Server on-line help.
See ME319381 for a situation in which this event occurs.
As per Microsoft:
Explanation: A generic port scan attack was attempted against a computer protected by ISA Server. This alert occurs when an attempt is made to scan ports on this computer to detect the services running on it.
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 (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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