Let’s Encrypt’s May 13, 2026 profile changes, along with Certbot’s support for shorter-lived certificates, mean renewal needs to be reviewed as an operational system rather than left on autopilot.
Ubuntu 26.04 LTS ships with stricter Apache and Nginx TLS defaults. That is the right move, but because TLS 1.0 and TLS 1.1 are formally deprecated, older partner systems, internal tools, and devices need staged handshake, certificate, and rollback testing before production rollout.
A practical guide to setting up Cloudflare SSL on a VPS the right way: choose the right origin certificate, use Full (strict), centralize redirects, and avoid the common Nginx and Cloudflare mistakes.
Practical guidance for enabling TLS on a Linux mail server with Postfix and Dovecot, including current settings, certificate renewal, DNS alignment, and the difference between public SMTP and authenticated submission.