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Event ID: 20066 Source: MicrosoftISAFirewall

Level
Description
Registration with the H323 Gatekeeper at address 10.0.0.1:1719 failed. This will prevent inbound calls.
Comments
 
From a newsgroup post: "Disable the H.323 Application Filter if you do not support H.323 through your ISA. It is just noise in the event log at this point. In the ISA MMC, go to Extensions | Application Filters, right click the "H.323 Filter" and select "Disable". It will then give you the choice of restarting the firewall service".

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