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Event ID: 21137 Source: MicrosoftFirewall

Level
Description
The connectivity verifier "<connection name>" reported an error when trying to connect to <IP address>.
Reason: <reason>.
Comments
 
As per Microsoft: "This event occurs when the connection between the ISA Server computer and the specified destination server cannot be established using the requested verification method. A connectivity verifier may fail to connect to a destination for one of the following reasons: The server you are trying to verify connectivity with may not be responding. The server or service running on the machine may be malfunctioning or over flooded". See the link to "Microsoft event 21137 from source Microsoft Firewall" for information on this problem.

ME839509 provides information on how to configure connectivity verifiers to monitor selected computers and networks in ISA Server 2004.

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