Problem with SSL Lets Encrypt & Roundcube in that place

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My domain is:

I ran this command: Lets Encrypt

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

Could not issue a Let’s Encrypt SSL/TLS certificate for .

The authorization token is not available at
To resolve the issue, make sure that the token file can be downloaded via the above URL.
See the related Knowledge Base article for details.

Invalid response from


Type: urn:ietf:params:acme:error:unauthorized

Status: 403

Detail: Invalid response from []: “\n\n404 Not Found\n\n

Not Found


My web server is (include version): Apache + Nginx

The operating system my web server runs on is (include version): Ubuntu 18.0.4

My hosting provider, if applicable, is:

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

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

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

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Hi @unknys

what’s the client you use?

That’s not possible. Port 80 - only one webserver can answer.

Checking your subdomain there is a Plesk -

So I hope you use the internal Plesk client. Not Certbot or another client.

Port 80 - there is a nginx. So your vHost configuration may be buggy.

Is the subdomain defined in your Plesk?

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FYI: The way Plesk works: website served on Apache, then proxied by Nginx.

From Let’s Debug, this domain have an invalid CAA record that will prevent issuance.

It seems like you used a third-party DNS provider and not pointing your NS records to your lease web instance.
(That might allow you to use DNS validation)

Thank you

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