UFW on Host needs to allow 6443/tcp

[pointout]

I installed on Hetzner CX21 with Ubuntu 18.04. I am only using the jitsi container. When I activated UFW on the host with sudo ufw allow ssh sudo ufw allow http sudo ufw allow https sudo ufw allow 30000/udp the jitsi url had an 404 error. I also had to allow port 6443 sudo ufw allow 6443/tcp Maybe there is a routing rule for ufw, that port 6443 will not be exposed to the outside?