Why doesn't my Ingate Firewall receive packets sent to one of its relays?

Problem description

A server was placed directly connected to the Internet, but now the firewall is moved in between. This has resulted in packets not arriving to the IP address formerly used for this server, now for the firewall.

What to do

The probable cause to this is that the router acting as default gateway for the firewall locks the IP address to the MAC address of the server. This is reset when the router times out or is rebooted.

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