Most likely this is not your issue, but just in case… I have 2 wifi networks at home and it has happened that my computer goes on network 2 while my HA Yellow Box is on network 1. Then the local connection won’t work.
I don’t think you should be forwarding port 8123 to your home assistant port 8123, you should be forwarding port 443 to whatever port NGINX is listening on. NGINX will then direct the traffic to home assistant.
I say this without a good understanding of how HAOS and these add-ons are set up to work together; personally I run HA core in a docker container and NGINX in a separate docker container. But at the end of the day, if you are forwarding port 8123 from your router to port 8123 on HAOS then you are skipping NGINX entirely
Thanks for your reply. Are there any way that NGINX use other port that 443? Because my ISP doesn’t allow to open that port because its router uses it to manage the router ( 80 and 443)
I open both port from router config but the reality is if I checked them from pages like “canyouseeme” it says it cannot be reached
I don’t know if you can configure the NGINX HA addon to listen on a different port. But if you have it listening on something that is not 443 you’d have to access that address by specifying the port explicitly. For example if you are forwarding 8123 then you will need to access your address from the Internet as https://mysubdomain.duckdns.org:8123