@raven-au the issue was resolved by installing (Tailscale with subnet routers) on the PC and setting up the NAS as an exit node via Tailscale. this is a good solution.

@David-TP The 2 IP Adresses are not the same, so it's CG-NAT. Is there a workaround for this? Can I change the DECO Operation Mode to a different one than 4G/5G Router to solve this issue if I use a...

I have at home a DECO BE65-5G and a WatchGuard T25W. In the meantime, via the Deco app on my phone, I have set up under 'More -> Advanced -> NAT Forwarding -> Port Forwarding' with the following...