Just to clarify. I have 80 and 443 as TCP and 51820 (sorry for the typo) as UDP. I used the automatic installer script. Doesn’t that generate the config files? If not, then probably there lies my problem.

Pangolin is like cloudflare tunnels, but you can self host it

Old computer, or Raspberry pi with proxmox and pfsense on it. The positive thing is that you can run other servers as well (pi-hole for example for network wide blocking ads)