HELP! Let's Encrypt and CloudFlare: Error 526 when using Full(Strict) SSL. (Ubuntu 16.04 & Apache)

It’s definitely using the older certificate. That’s definitely a problem, and it might be the only problem.

Apache has a lot of configuration files. Could you provide, in order of most to least important, the files in sites-enabled, the files in conf.d, and ports.conf? And any other important files that they Include

When was the last time Apache was reloaded or restarted? If it was before the 13:55 certificate was issued, that might be all you need to do. (Aside from the redirect configuration.)

Edit: “certbot certificates” looks good, though.

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