Os-nginx as reverse proxy issues

[jackjason]

Hello i would like to get some assistance on my setup. i setup the reverse proxy side via the given guides. even made the firewall rule to allow 443 and 80 on wan-side (this firewall) but somehow when i try to acces my proxied site i get this  ( This site can't be reached ERR_failed) when trying to acces it. in metrics i see a connection hasbeen made but other than that nothing. what i want proxied lives inside a vlan do i need to create some sort of firewall rule to it inside the vlan or the proxy it self has some issues? im just lost at this point.