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Event ID: 15005 Source: MicrosoftISAServerControl

Level
Description
ISA Server detected a all port scan attack. For more information about this event, see ISA Server Help.
Comments
 
As per Microsoft:
Explanation: A all port scan attack was attempted against a computer protected by ISA Server. This alert occurs when an attempt is made to scan 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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