I was recently trying to get a server for Ark: Survival evolved working, it appears to be running fine, but at the moment it won't appear as an option for players outside the local network. I know my router's port forwarding should be working, as I already have a minecraft server running on the same debian 11 server that I plan to run ARK on.
I currently have it set up to forward port 25565 (for minecraft), and ports 7777 and 27015 (which was what was suggested here