Connection for Deconz in Node-red via DuckDNS and Lets encrypt

HI there I am a newbee in Home Assistant, så be gentle :wink:
I have a Hassio (0.100.2) in Vmware ESXI 6,5 running on a Lenovo SFF, with a Conbee 2 and newest software, firmware on all systems :slight_smile:
My problem is when trying to connect Node-Red (Addon) to the deconz (Addon), it wont connect via the internal IP (ip 192.168.0.117 webport 40850 socket 40860)
For info - i can’t acces hassio on the local IP but i have to use “MyChosenDomain.duckdns.org

Any advise, Hints or obvious newbee errors ?

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Did you solve the issue? I’m in the same kinda pickle