Deploying Portainer behind nginx or Traefik reverse proxy on Ubuntu 24.04 (LTS) x64

[Cinezaster]

Hi I have tried all methodes deploying Portainer behind a proxy described on https://docs.portainer.io/advanced/reverse-proxy on a Ubuntu 24.04 (LTS) x64 Digital Ocean server.
I tried Standalone and swarm.
Followed all the steps.
Nginx seems not to be reachable, keeps getting timeout.
Traefik service keeps on crashing.
I have a digital Ocean droplet with ports 80, 433, 9000 and 9433 open.
Don't know how to debug this properly.