Event ID - 21163

Event Id21163
SourceMicrosoft ISA Server Job Scheduler
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 :
CAUSE :
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.

SOLUTION :
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 LinksEvent ID: 21163 Of Source ID:Microsoft ISA Server Job Scheduler

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