Event ID - 21163

Event Id21163
SourcePOP Intrusion Detection Filter
DescriptionThe Firewall service detected that the demand dial interface %1 was assigned an IP address from network %2. This may indicate a configuration error.
Event InformationAccording To Microsoft:
This event occurs when the specified VPN site-to-site network adapter is assigned an IP address that is already included in another network. This may be an indication of a spoof attack.

Verify that the VPN configuration for the remote server is defined properly.Try to reestablish the connection and ensure that the connection is with the correct remote site.
Reference LinksMicrosoft product: Internet Security and Acceleration Server Version: 4.0.3443.594 Event Source: POP Intrusion Detection Filter Event ID: 21163

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