SSL certificate expiry monitoring: best practices for 2026

Modern TLS certificates expire faster than ever. Let's Encrypt issues 90-day certificates by default; the CA/B Forum maximum is 398 days. That sounds short, but the operational reality is brutal: a single missed renewal can take down production, drop search rankings, and lose customer trust in a single afternoon. This guide covers how to design an alert cadence that gets acted on, how to monitor certificates across many environments, and how to integrate expiry alerts into your incident management workflow.

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