SSL certificate of anonramblings was invalid for a couple of days. Since I was in my summer holidays, it took me some time to handle the credentials and SSH access in the server to update the certificate.
Since certbot/letsencrypt certificates are valid for much smaller time frames lately, here is a command to update the certificates when necessary:
$ certbot renew --post-hook "systemctl reload nginx"
Add that into a daily crontab entry, and you're good to go. On a side note, anyone care to comment on this farting problem?