I am trying to get remote access to work. Followed the instruction on https://www.juanmtech.com/hassio-duckdns-add-on-set-up/.
The DuckDNS Plugin seems to work as well as the port forwarding of my router (forwarded extern port 443 to local port 8123). However, if I try to access my domain https://xxx.duckdns.org I got the follow error message showing up:
#400 Bad Request
Webserver Mon, 21 Jan 2019 20:42:13 GMT`
Does anyone has an idea what is going wrong?