Can't acces Home Assistant within my network ater setting up DuckDNS

I set up Home Assistant at my parents house, and to troubleshoot their problems I would like to remotely login, so I also set up DuckDNS. But now this happens…I’m not able to acces Home Assistant on their LAN network anymore by the following addresses:

http://homeassistant.local:8123
https://homeassistant.local:8123
https://domain.duckdns.org
http://ip-addres:8123
https://ip-addres:8123

None of the above addresses work… The http://ip-addres:8123 does load, but gets stuck on the Unable to connect, retry in ... seconds page and will never load the UI.

I CAN acces outside of their LAN with the DuckDNS addres.

configuration.yaml:

default_config:

http:
  ssl_certificate: /ssl/fullchain.pem
  ssl_key: /ssl/privkey.pem 

What am I missing?

@moostmartijn , Good afternoon,

Have you set up port forwarding in your parents’ router as well?
This is necessary to get in.

Yes, it works perfectly as I can connect to Home Assistant (outside their LAN) with the DuckDNS address.

https://domain.duckdns.org:8123
Zag ik er nog niet bij staan in je geprobeerde adressen. Zo werkt het bij mij wel. Ik gebruik geen Local. Behalve als ik port forwarding uitzet.

Have you try this? I dont see this option in your list.
I dont use local, except i dont use port forwarding.

https://ip-address:8123
should work, but not from IOS (apple doesn’t allow loading of a web page with wrong certificate)

Maybe stupid question, but did you set up nginx ssl proxy?
I just use for http:

http:
  use_x_forwarded_for: true
  trusted_proxies:
    - 172.16.0.0/12

I removed ssl lines from configuration.yaml because I was having issues with it and nginx ssl proxy should deal with certs if I understand this correctly.

@aceindy unfortunately it doesn’t work. The webpage does load, but says ‘Unable to connect’

@ddaniel I don’t use NGinx proxy, but I read that this could solve the problem. But I never had this problem with my own installation, so I hoped I was missing something or there was a quick fix.