Could not issue an SSL/TLS certificate for

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My domain is:

CPU DO-Premium-AMD (1 core(s))
Version Plesk Obsidian v18.0.36_build1800210604.22 os_Ubuntu 20.04
OS Ubuntu 20.04.3 LTS
Key number PLSK.08260938.0000

I ran this command: SSL/TLS Certificate

It produced this output:
Could not issue an SSL/TLS certificate for

Could not issue a Let's Encrypt SSL/TLS certificate for . Authorization for the domain failed.

Invalid response from

Type: urn:ietf:params:acme:error:dns
Status: 400
Detail: No valid IP addresses found for

Hi @huanvuduc, welcome to the LE community forum :slight_smile:

You need a functional HTTP site before you can secure it (via HTTP authentication).
The first thing on that list is having an IP address. does not resolve to an IP address.
You need to update the DNS zone to return the IP address of that DO server.
Your current nameserver list might also need to be modified - if they aren't the ones where you are going to maintain your DNS zone.
The current authoritative list shows:  nameserver =  nameserver =  nameserver =  nameserver =

When DO nameservers are queried, an IP address is returned:


And when a DO nameserver is asked: Who are the authoritative nameservers for your domain?
They only list DO nameservers:

nslookup -q=ns  nameserver =  nameserver =  nameserver =

So it seems that you just need to update your nameservers at your domain registrar.

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