Explaining what happened to me.
Internal Network was configured with two physical NIC's in bridge mode, to extend the topology.
Worked fine until one of the NIC failed. But the worst thing was after the reboot, any configuration about Internal Network was deleted, Firewall Rules, NAT, Masquerading etc.
I had to login from WAN and restored a backup with no Birdge. Or I had the Option to riconfigure all Internal Network.
So the lesson: Keep always a good backup with no bridged interfaces
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