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Event ID: 14020 Source: MicrosoftFirewall

ISA Server failed to load the firewall policy configuration. The failure occurred while loading the policy element "<element name>". For details about this error see the event properties in the Windows Event Viewer.
I manually checked every policy rule for any suspicious error. In my case, it turned out to be a listener that was misconfigured. After a reconfig of the policy rule the problem disappeared.

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