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Event ID: 15103 Source: Microsoft ISA Server Control
|Source: Microsoft ISA Server Control|
ISA Server detected a land attack on Internet Protocol (IP) address %1. For more information about this event, see ISA Server Help.
|English: Request a translation of the event description in plain English.|
As per Microsoft:
Explanation: A land attack was attempted against a computer protected by ISA Server. This alert occurs when a Transmission Control Protocol (TCP) SYN packet or User Datagram Protocol (UDP) packet is sent with a spoofed source Internet Protocol (IP) address and port number that is identical to that of the destination IP address and port. The effect of this makes it appear that the host computer has sent a packet to itself. If this attack is successful, a loop is created and the computer crashes.
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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