DDNS only working if put the port at the end or url : r/synology
External IPv6 does not get updated in Synology DDNS? | Synology Community
DDNS doesn't work and shows "Connection failed. Cannot resolve the IP address of the server." What can I do? - Synology Knowledge Center
How To Setup Synology Drive Server Using DDNS And Port Forwarding For Remote Access - YouTube
networking - Unable to connect to Synology NAS using my Synology domain over HTTPS on internal network, need to configure DNS Server on NAS? - Super User
Synology NAS External Access Quick Start Guide - Synology Knowledge Center