TOPIC: DOMAIN NAME
Adding a new domain or subdomain to an SSL certificate using Certbot
11th June 2025On checking the Site Health page of a WordPress blog, I saw errors that pointed to a problem with its SSL set up. The www subdomain was not included in the site's certificate and was causing PHP errors as a result, though they had no major effect on what visitors saw. Still, it was best to get rid of them, so I needed to update the certificate as needed. Execution of a command like the following did the job:
sudo certbot --expand -d existing.com -d www.example.com
Using a Let's Encrypt certificate meant that I could use the certbot command, since that already was installed on the server. The --expand and -d switches ensured that the listed domains were added to the certificate to sort out the observed problem. In the above, a dummy domain name is used, but this was replaced by the real one to produce the desired effect and make things as they should have been.
New domain name
25th January 2007I have registered the domain technologytales.com for this blog yesterday and have since got the DNS configuration completed. I used Easily.co.uk for the registration; they also host my other domain name and have done so since I first registered it. Easily allowed me to transfer to the WordPress.com namespace servers and $10 secured the rest of the setting up and $10 every year at renewal time with keep things in place. There is more about doing all of this on the WordPress FAQ.