How to Renew / Auto Renew for Synology DDNS?

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g., so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is:

I ran this command:

It produced this output:

My web server is (include version): N/A

The operating system my web server runs on is (include version): Synology DiskStation Manager 6.2.3-25426

My hosting provider, if applicable, is: N/A

I can login to a root shell on my machine (yes or no, or I don't know): Yes, kind of

I'm using a control panel to manage my site (no, or provide the name and version of the control panel): Yes, kind of ... Synology Disk Station Manager

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): I don't know; I've setup DDNS on a Synology Disk Station


Hi and welcome to the Let's Encrypt community forum.

It seems that you were able to get a cert a few months ago: |

But you are now unable to renew it and possibly want to automate those renewals.
You mention:

But global DNS can't resolve that name to an IP:
*** can't find Non-existent domain
*** can't find Non-existent domain
*** can't find Non-existent domain
[this will be critical to the HTTP authenticated renewal process]

Has anything changed within the network since the cert was issued?
[IPs | Firewall rules | NAT/Port forwarding | DNS]


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