Hass.io with synology is not external reachable

Hey people,

I want to make a docker container, home assistant, reachable from the internet and I hope you can help me. First things first: Everything works pretty fine with the local ports.

In generally my synology set up is reachable over ipv6 over a hosted domain from strato. The container network is host and I set the port to reachable in the firewall. If I try to open the webside, I got the error xxx.com has refused the connection. If I make a reverse proxy to localhost, I cann see the login site, but if I want to log in, , it is unable to connect…

I have a 918+ and a Connectionbox from unitymedia.

I am pretty sure I do something wrong, so thanks for advice