Changed public IP can't connect

Hi,

I had a rust server running. Recently i changed my internet provider, router had static IP and DMZ to my firewall. The new router had the same 'LAN' IP and has also DMZ to my firewall.

The only change is I have a new public IP. I changed the dns for the subdomain i had pointing to my old IP and changed the relay server IP to the new one but that seems not to be enougth.

What am I missing?