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No valid IP address found for domain when trying to get SSL certificate?

Posted August 30, 2020 201 views
NginxUbuntuSecurityUbuntu 20.04

As I was following the tutorial found here: [https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-20-04](http://) in order to get my SSL certificate.
On step 4 I am asked to run the following command sudo certbot --nginx -d example.com -d www.example.com with my domains which are working, I keep getting the following error: No valid IP addresses found for m.ca (my domain). I waited the 48 hours as instructed by Google domains after changing name servers and keep getting the same issue.

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ahsam
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ahsam
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Yannek August 30, 2020

Hi,

Is it really domain m.ca ? I tried few whois lookup web sites and got the same result - domain has not got an owner. In such case, there is no chance to get a certificate for it.
But, if you put m.ca just as an example of your domain, then find out what https://letsdebug.net/ says when you enter your actual domain there.

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  • ahsam August 30, 2020

    Sorry, the domain is meraha.ca

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    • tomnguyen August 31, 2020

      Hi @ahsam,

      As mentioned in the Prerequisites section of the tutorial How To Secure Nginx with Let’s Encrypt on Ubuntu 20.04, you must create two DNS records for your domain meraha.ca:

      • An A record with meraha.ca pointing to your server’s public IP address.
      • An A record with www.meraha.ca pointing to your server’s public IP address.

      I see that you have only created an A record with www.meraha.ca but not meraha.ca. You must create another A record with meraha.ca as well. This document has detailed information to help you. Note: because meraha.ca is an apex domain, enter the @ symbol in the HOSTNAME field.

      After that, run this command to obtain your SSL certificate: sudo certbot --nginx -d meraha.ca -d www.meraha.ca

      How To Secure Nginx with Let's Encrypt on Ubuntu 20.04
      by Brian Boucheron
      Let's Encrypt is a Certificate Authority (CA) that provides an easy way to obtain and install free TLS/SSL certificates, thereby enabling encrypted HTTPS on web servers. It simplifies the process by providing a software client, Certbot, that attempts to automate most (if not all) of the required steps. In this tutorial, you will use Certbot to obtain a free SSL certificate for Nginx on Ubuntu 20.04, and set up your certificate to renew automatically.
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