After receiving the email about ending TLS support, I updated my certbot from apt (Ubuntu Xenial) and ran the
certbot renew --dry-run command and it says, in part: “http-01 challenge for…” for each of my domains. That seems like it’s saying that the validation method is now HTTP instead of TLS? Is that right?
Thanks for your help, and thanks in general to the whole Let’s Encrypt project.