PR_CONNECT_RESET_ERROR when trying remote acces with duckdns

Hello everyone.
I try to do a remote access using duckdns add-on and i get :
PR_CONNECT_RESET_ERROR on my browser.
i did follow this tutorial : Access Your Home Assistant Server Remotely With DuckDNS and Let’s Encrypt
Duckdns log is ok
I did port foward 8123>8123 tcp and 443>8123 tcp on my router
I can acces locally with https (but the connexion is not secure) to HAS but not from outside.
I hope to find someone who can help me, thanks in advance.

Finally i give with duckdns…
I use Tailscale add-on, this is simple to install and enought efficient for my needs.
may be it can help…