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Event ID: 15117 Source: MicrosoftFirewall

Level
Description
The request was denied because the number of connections per second allowed for the Allow All rule was exceeded. See the help for more information on connection limits.
Comments
 
As per Microsoft: "ISA Server rejected a connection from the client because its connection limit was exceeded. The event could indicate a flood attack. Use the log filter to determine if the source of the connection is legitimate or the result of a flood attack". See the link to "Microsoft event 15117 from source Microsoft Firewall" for additional information.

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