Unable to get duckdns working on a fresh hass.io install

Installation Home Assistant OS
1

A previous install of HA in a friends house got corrupted, so I went to go and rebuild it for him…

Try as I might, on a fresh install of hass.io (v0.103.0) I first install Samba, then DuckDNS. All goes fine in the DuckDNS setup, it generates the keys etc. I update http in configuration.yaml with:

http:
  base_url: https://[mydomain].duckdns.org:8123
  ssl_certificate: /ssl/fullchain.pem
  ssl_key: /ssl/privkey.pem

and when trying to access I get the error: “[mydomain].duckdns.org unexpectedly closed the connection”.

There are no errors in home-assistant.log

We had it running previously on the same port, so I’m pretty confident its not a router issue.

Any suggestions gratefully received.

2

Did you open ports on your router?
Check it again, maybe your IP address changed after the install.

Try here to check if its visible from outside:
Can You See Me

3

It’s the same Pi running HA as before, so has a fixed IP and router forwards 8123 on…

4

Uninstalling the DuckDNS add-on and reinstalling it seems to do the trick - looks like the add-on needs all the config right first time and isn’t very forgiving to change it later.