After receiving the “Action required: Let’s Encrypt certificate renewals” email, I checked and saw that my certbot version is 0.27.1, meaning that I have to upgrade certbot, according to How to stop using TLS-SNI-01 with Certbot .
The Let’s Encrypt installation is on an Amazon Linux 2 server. Is anyone aware of where instructions have been posted on how to accomplish this upgrade, or could anyone be kind enough to explain how this is done?
Yes, on this operating system yum is used and not apt. I think that I will need to update certbot from the EPEL packages, as suggested in the link that I posted in the earlier comment.
Certbot 0.27.1 can be used with http authentication.
So you should try that out before making too many changes.
You can force it with the --dry-run test.
[which will test both the client and the path for http correctness]