Nginx proxy manager / DuckDNS - Hmmm… can't reach this page

I had everything working for months, but for some reason my certificates didn’t get renewed.
Now I tried setting up a new proxy, but at the step (in the example gif) that the created link “demo.hass.link” is clicked, I don’t get the log in screen but a screen with Hmmm… can’t reach this page
ERR_CONNECTION_TIMED_OUT
When I directly go tho http://192.168.1.5:8123 I get the log in screen.

Where to find the solution !??