Event ID - 21163

Event Id21163
SourceMicrosoft ISA Server Control
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.

Resolution:
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: Microsoft ISA Server Control Event ID: 21163

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