How do I set up port forwarding rules on my Synology Router? - Synology Knowledge Center
Tutorial: setup a DDNS in DSM - Tutorials and Guides - XPEnology Community
DDNS doesn't work and shows "Connection failed. Cannot resolve the IP address of the server." What can I do? - Synology Knowledge Center
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
Frequently asked questions about Synology DDNS service – S thailand
Can I Use Two synology.me DDNS Services on Two Different NAS at Home? – Marius Hosting