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Event ID: 15108 Source: MicrosoftFirewall

Level
Description
ISA Server detected a spoof attack from Internet Protocol (IP) address <IP address>. A spoof attack occurs when an IP address that is not reachable via the interface on which the packet was received. If logging for dropped packets is set, you can view details in the packet filter log.
Comments
 
See the link to "EventID 15108 from source Microsoft ISA Server Control" for details on this event.

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