1. Make sure DDNS (in my case it is nas.raszewski.info) works and the domain gets resolved to a public IP of your router
ping nas.raszewski.info
PING nas.raszewski.info ( 56 data bytes
Request timeout for icmp_seq 0

2. Forward PORT 80 of the WAN interface on the router to PORT 80 on Synology NAS.

DO NOT forward PORT 80 on ports 5000 or 5001 on which DSM Web interface runs!


Delete all the expired certs you may have

Request a new cert


You have to keep the port forwarding configuration enabled at all time if you want the cert to get automatically renewed.


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