Technicolor router problems

The specifications of the gateway or modem/router are:

Software Version CGA4233TCH3-19.3A47-020-PCU-RMQ
Model Name CGA4233TCH3
Vendor Technicolor
Firmware Version
CGA4233TCH3-19.3A47-020-PCU-RMQ
Firmware Date 2023-01-24 03:30:43
Bootloader Version 3.62.15.13

I couldn’t do port forwarding.

A PC connected to that network has a Linux Ubuntu server and a static private IP configured with Netplan.

Port forwarding does not work in this case with a static private IP.

You must revert the netplan changes and make the private IP obtainable with DHCP, that is, dynamic.

put this configuration:

network:
  version: 2
  renderer: networkd
  ethernets:
    enp2s0:
      dhcp4: true

an image: