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Event ID: 15004 Source: MicrosoftISAServerControl
Explanation: A well-known port scan attack was attempted against a computer protected by ISA Server. This alert occurs when an attempt is made to scan well-known ports on a computer to detect services running on these ports.
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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