I got an email from Let’s Encrypt warning me that my certificates are expiring in 19 days.
sudo systemctl status certbot.timer, I confirmed the upcoming expiration date.
I then attempted a dry run for renewal with
sudo certbot renew --dry-run and received the following message:
http-01 challenge for radio.nessradio.net Waiting for verification... Challenge failed for domain radio.nessradio.net http-01 challenge for radio.nessradio.net Cleaning up challenges Attempting to renew cert (radio.nessradio.net) from /etc/letsencrypt/renewal/radio.nessradio.net.conf produced an unexpected error: Some challenges have failed.. Skipping. All renewal attempts failed. The following certs could not be renewed: /etc/letsencrypt/live/radio.nessradio.net/fullchain.pem (failure)
Can someone explain how to set up automatic renewal for the certificates?