Synology "Replace Existing Certificate"

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My domain is:

I ran this command: Synology GUI

It produced this output: Unable to connect to Let’s Encrypt, make sure the domain name is correct.

My web server is (include version): ngix

The operating system my web server runs on is (include version): Synology DSM6

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

I’m not too new to this, I setup my Synology a couple of years ago. It has been fine and renewing Let’s Encrypt ever since. Today, I wanted to replace the cert to add a couple more “Subject Alternative Names.” It is failing with the above error and I have no idea why. Nothing has changed and like I said, renewals have been chugging right along for years.

Ah, disregard. My bad. I also cleaned up and removed the wrong alternative name in my DNS. I assume LE was looking for it and not finding it.


Make sure you keep your DSM software up-to-date and you should be fine :slight_smile:


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