Synology - Let's Encrypt is unable to validate this domain name

What tools can I use to check to see why my domain can not be validated.

I have check the Certificate Transparency logs (e.g. |

My domain

I'm using Synology DSM 7.0.

A browser should give an explanation. But, I often use a test site like this SSL Checker. Or, try the Server test at

Using those, I see the problem is your server is using a self-signed certificate instead of the one you created with Let's Encrypt. You should refer to your Synology docs on how to configure that.


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