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Event ID: 21174 Source: MicrosoftFirewall

Server publishing rule <rule> failed because there was no valid network listener. For requests to reach the published server there must be a network relationship between the selected listener networks and the published server. Location <location number>. For more information about this event see ISA Server Help.
In our case this happened on a server where the external interface configured for ISA was a PPPoE connection. At restart, the connection was not yet established so ISA failed to bind the configured network listener to it. Re-establishing the PPPoE connection fixed this issue. Event id 14148 was also recorded.

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