Problems with Duckdns

First of all, I apologize for using Google Translate for my post, but my English isn’t the best anymore.
I’ve completely reinstalled my home assistant and reconfigured my Duckdns today.
But now I have the problem that I can no longer access my home with my Duckdns address.
When I did this for the first time six months ago, there was no problem.
I’ve attached a few screenshots here so you can get a better idea.
I’ve also tried everything possible in the router, so it’s possible that something is wrong here at the moment too.

This is the entry in my Configuration.yaml

http:
    ssl_certificate: /ssl/fullchain.pem
    ssl_key: /ssl/privkey.pem
    cors_allowed_origins:
        - https://google.com
        - https://www.home-assistant.io
    ip_ban_enabled: true
    login_attempts_threshold: 5

Here is a screenshot of my DuckDns configuration:

The strange thing is that when I enter https://axxxn.duckdns.org, my browser cannot open the page. It doesn’t matter whether I add the port :8123 or not.

However, if I enter https://192.168.178.24:8123, then I get to HA.

I hope you can help me so that my remote access finally works again.