[{HVY-E}Jinxx]

Hello!

As you may guess I have not set up our network, but the only "box" we have up in the attic is Telewell TW-EA510v3.
The header says "ADSL modem/firewall"

As I see from the settings DMZ is not enabled.

So do I select the port I want to edit, then check "DMZ enabled" and set it's IP to the server ip or the router-modem IP?

Do you have a static ip setup?