Please check the port forwarding and firewall settings on your Synology NAS and router to make sure the UDP port 1701, 500, and 4500 are open. L2TP or IPSec VPN service is built-in on some routers, the port 1701, 500 or 4500 might be occupied.
the nginx configuration on the Synology is somewhat different; so when you setup wifi.example.com to your home ip-address; then you have to configure your router to port-foward port 80 to port 80 on your synology on your synology you need to configure the www-station, so the nginx is really the backend. In my case it was first set to Apache Why and how to forward routerports - Synology Forum Sep 26, 2012 Synology 2019 Configuration Guide Part 4: Basic Security
Mar 18, 2018
REMOTE ACCESS YOUR SYNOLOGY NAS VIA QUICKCONNECT, … What You’ll Need. A Synology NAS with the latest DiskStation. Working Internet Connection. An …
Orbi Doesn't Port Forward 80 to Synology - NETGEAR Communities
Dec 27, 2019 Orbi Doesn't Port Forward 80 to Synology - NETGEAR Communities