Check Before Adding Certificates | Who Do Cloudflare's 2FA and SSL Protect?

Among Cloudflare settings, those that often cause confusion include two-factor authentication, SSL/TLS, edge certificates, ...
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Let's Encrypt details changes to certificate issuance, including new certificate chains, removal of Client Authentication EKU, and shorter certificate validity periods.

Let's Encrypt has announced details of its overall policy regarding certificates issued going forward, including 'certificate chain renewal,' 'removal of TLS client authentication EKU (Enhanced Key ...