Problems with http and Sagemcom F@st 5657

Configuration
1

Hi.

I am trying to configure duckdns on my pc with virtualbox.

From my PC I was doing tests with a router, in another house, and everything was working correctly.

Now I am at home, with another router, and I have tried the same configurations for my duckdns and I cannot get the duckdns route or “https://192.168.1.xxx” to work.

I have updated my IP and with the duckdns address I get absolutely nothing.

With “https://192.168.1.xxx” I get login but I get a window with “Unable to connect to Home Assistant.”

I think my problem is the router. I have a “Sagemcom F@st 5657”. I have opened the ports in TPC / UDP and I have activated the DMZ.

I do not know what else to do.

Regards, and thank you very much.

2

I answer to myself:

The main problem is that my internet company had CGNAT active. I already have it fixed.

Now I have another problem but it is another story.