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Problem

  1. Suddenly Certbot is not working with the error ‘Certbot failed to authenticate some domains …’

  2. I haven’t changed anything in the DNS

  3. I haven’t upgraded Certbot

  4. I installed certbot using apt install python3-certbot, not using snap

  5. I haven’t enabled Cloudflare Proxy on this domain

How To Fix That

  1. Use certbot --nginx rollback or just certbot rollback.

    This is an option for rolling back server configuration changes. I don’t know why I need to do this, since I haven’t changed anything in the nginx config.

  2. Run certbot renew

Certbot Renew Now Successful!

Certbot Renew Now Successful!

References:

  1. Certbot Docs