CONFIGURING AUTO RENEWING LETSENCRYPT SSL CERTS WITH NGINX AND CERTBOT

https://absolutecommerce.co.uk/blog/auto-renew-letsencrypt-nginx-certbot

Enable IPv6 on your newer CenturyLink modem

https://www.centurylink.com/home/help/internet/modems-and-routers/advanced-setup/enable-ipv6.html