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Event ID: 21245 Source: MicrosoftFirewall

Level
Description
The local tunnel endpoint of VPN site-to-site network <network name> is incorrect. Server <server name> cannot connect to the remote site using the <ip address> local tunnel endpoint.
Comments
 
This symptom occurs when trying to establish IPSec Tunnel Mode site-to-site connections when ISA server is located behind a NAT device.

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