There was a ‘web socket’ entry missing in the settings for reverse-proxy. I found this post about setting-up the synology DM.
When the web socket is missing, then reverse-proxy needs the original port added so:
- NO socket ==> http://energy.lan does NOT work ==> http://energy.lan:8123 works
-WITH socket ==> http://energy.lan works.
I will continue my installation now.
Regards
Ludo
https://community.home-assistant.io/t/reverse-proxy-through-synology/274660/3