21CTO
Dec 2, 2025 · Information Security
What Let’s Encrypt’s New Certificate Validity Rules Mean for Your SSL Setup
Let’s Encrypt will shorten default TLS/SSL certificate lifetimes from 90 to 45 days and reduce domain‑validation reuse windows to seven hours, rolling out a trial in May 2026, a default change in July 2027, and full enforcement in August 2028, while also introducing a persistent DNS‑TXT validation method.
ACMELet’s EncryptSSL
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