Okay, let’s dive into the Docker stuff. 
To check the port mappings of your running Docker containers, you can use the docker ps command. It’ll show the port mappings in the PORTS column. Here’s the exact command to run:
docker ps
Look for your Valheim container in the list and check the PORTS column to see which ports are mapped. You should see something like 0.0.0.0:2456->2456/udp and 0.0.0.0:2457->2457/udp.
If the ports aren’t mapped correctly, you might need to update your Docker container settings. If you’re using docker run to start your container, it should look something like this:
docker run -d --name valheim_server -p 2456:2456/udp -p 2457:2457/udp your_docker_image
Check this and let me know what you find! 
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