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Authentication shows incorrect ip address in Event viewer

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Last Modified: 2018-10-25
We have a Windows 2012 R2 domain with 2 domain controllers. Users authenticate to the domain with no problems.

We have 2 subnets
LAN: 192.168.0.0/24
WLAN: 192.168.4.0/24

The WLAN traffic is routed through our Sophos XG230 Firewall/Router 192.168.0.1

Any user authenticating against one of the domain controllers (from the WLAN) shows  the ip address of the Firewall/Router, not its correct ip address of hte host they are on.

I can see this in the kerberos TGT in Event Viewer 4768.

This is only happening on 1 of the domain controllers.

Any ideas on how troubleshoot would be greatly appreciated.
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