Server Certificate Signature - failed

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My domain is:

I ran this command:

It produced this output:

My web server is (include version):

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

My hosting provider, if applicable, is:

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

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):

Recently we got some errors from our monitoring system on N-Central saying that there was a few websites that we host had failed. When I browse the website it shows that the certificate is valid. N-Central support suggest that it may be an issue coming from the root certificate from Let;s Encrypt. They said in order to solve the issue we need to upload the Root certificate under Administration >> Certificate Management.

can anyone help to how we can have the root certificate from Let's Encrypt so we can upload on N-Central?

Hi @Tiago welcome to the LE community forum :slight_smile:

All the LE root certs can be found at:
Chain of Trust - Let's Encrypt (

The one you want is likely:
[available in DER and PEM formats]
ISRG Root X1 ( RSA 4096, O = Internet Security Research Group, CN = ISRG Root X1 )

re: monitoring letsencrypt cert based https breaking:

A code drop was not necessary for this one, I just had to run a couple of scripts on your server to update the trusted CAs Please note that any https monitored by a probe will depend
on the windows update to deliver trusted CAs for that device, but your server should be good to go now, and a reboot should not be required

This was a communication to one of my partners, log a ticket with support please.

-Jason, N-central

It would be nice to know exactly what was run and which O/S and version it applied to.
[so that other readers may benefit from this knowledge]

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I don't have that information as N-central is a proprietary Remote management and monitoring solution. I do know we have a code drop to resolve this issue.
Kind regards, Jason from N-able

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