Deconz websocket not reachable


deconz is now working on HA. I transfered the configuration (the Backup via PHOSCON) and the stick from a raspbian to HA. DEconz itself works. Lights can switch as before, sensors and switches are working.

But now I cannot reach the websocket anymore. E.g. via Fhem or an app on my smartphone. I use the defaults: 8081 Different values for the websocket port also don’t work.

What should be the websocket URL for the connection? In my case homeassistant.domain:8081 ?
Do I miss a setting?