Code d’erreur : SEC_ERROR_UNKNOWN_ISSUER

i generate let's encrypt certificate in nov 2019 for use synology NAS in http/https

My domain is: emixandre.ddns.net for my nas server and jeedombb33.ddns.net for my jeedom virtual box

I ran this command: N/A

It produced this output:see belong

My web server is (include version): include in DSM 7.0

The operating system my web server runs on is (include version):
virtual machine
My hosting provider, if applicable, is:no-ip.com

I can login to a root shell on my machine (yes or no, or I don't know):yes but i can't write @ in it

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):
DSM 7.0
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): no certbot installed

image

@fcn33 Welcome to the community. I hope English is ok.

I see you have used Lets Encrypt for a long time: crt.sh | jeedombb33.ddns.net
And, you recently received 4 fresh certificates.

But, your Synology is sending a default certificate from Synology and not the Lets Encrypt certificate. Here is another way to see what Synology is sending:
https://www.sslshopper.com/ssl-checker.html#hostname=jeedombb33.ddns.net

I think you would be better getting help from a Synology forum. They know your device the best. You are successful at getting the Lets Encrypt certs as we see in crt.sh. It is just a problem to get your device to use them.

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