I’m trying to renew an expired certificate. But I don’t know how to do so. I tried to run sudo certbot --force-renewal because according to what I can read in the renewal site:
it causes the expiration time of the certificate(s) to be ignored when considering renewal, and attempts to renew each and every installed certificate regardless of its age.
So that seems to be exactly what I need. But then I’m getting an error.
My domain is:
I ran this command:
sudo certbot --force-renewal
It produced this output:
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator nginx, Installer nginx
Which names would you like to activate HTTPS for?
Select the appropriate numbers separated by commas and/or spaces, or leave input
blank to select all options shown (Enter ‘c’ to cancel): 1
Renewing an existing certificate
Performing the following challenges:
tls-sni-01 challenge for malvar.dynu.net
Waiting for verification…
Cleaning up challenges
Failed authorization procedure. malvar.dynu.net (tls-sni-01): urn:acme:error:unknownHost :: The server could not resolve a domain name :: No valid IP addresses found for malvar.dynu.net
The following errors were reported by the server:
To fix these errors, please make sure that your domain name was
entered correctly and the DNS A/AAAA record(s) for that domain
contain(s) the right IP address.
My web server is (include version):
The operating system my web server runs on is (include version):
Debian 9.4 stretch
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):