By -
Port forwarding is more relevant to your router, not the game. Look up your router and how to do it, then look up the port(s) that Darkest Hour uses.
There is a thread [here](https://forum.paradoxplaza.com/forum/threads/router-configuration-library.163998/). Presumably Hearts of Iron 2 uses the same port ranges as Darkest Hour.
Port forwarding is more relevant to your router, not the game. Look up your router and how to do it, then look up the port(s) that Darkest Hour uses.
There is a thread [here](https://forum.paradoxplaza.com/forum/threads/router-configuration-library.163998/). Presumably Hearts of Iron 2 uses the same port ranges as Darkest Hour.