systemd unit certbot.service has failed
first seen 44h agoThe certificate renewal unit is in a failed state. TLS certificates renew on a timer; if this stays failed, certificates will silently expire and every HTTPS site on this host will start refusing connections.
Run 'systemctl status certbot.service' and 'certbot renew --dry-run' to see why renewal is failing, and check certificate expiry with 'certbot certificates'.