Defaults.Exposed › Methodology › v7 registry › Certificate expiry
Certificate expiry
Methodology v7 · canonical ID cert-expiry-warning · TLS & Certificates · scored · census as of July 28, 2026
A certificate about to expire takes your site offline with a full-page warning.
Definition
| Canonical ID | cert-expiry-warning |
|---|---|
| Category | TLS & Certificates |
| Grade impact | Scored — counts toward the grade |
| Pass | The certificate's notAfter date is comfortably in the future (not expired, not inside the imminent-expiry window). |
| Fail | The certificate is expired or expires imminently. |
| Example (passing) | Not After: a date well beyond the scan date |
No-data rule: when this check couldn't be determined for a domain (timeout, SERVFAIL, redacted
source) it returns N/A and is excluded from that domain's scoring denominator — "couldn't determine"
is never counted as a failure. "Determined absent" is a real fail.
Prevalence across the census
The public census rollup does not publish a per-check figure for cert-expiry-warning (as of July 28, 2026).
Whole-census aggregates live at /data; no number is shown here rather than an estimated one.
Census denominator: 275,666,275 graded domains. Aggregates only — never an individual domain's result.
Fix it
Plain-English impact, cost of ignoring it, and step-by-step remediation: defaults.exposed/en/fix/certificate
Cite this check
Defaults.Exposed, "Certificate expiry (cert-expiry-warning)", Grading Methodology v7 (census as of July 28, 2026). https://defaults.exposed/methodology/v7/cert-expiry-warning
Permalink: https://defaults.exposed/methodology/v7/cert-expiry-warning ·
All 34 checks: v7 registry ·
Machine-readable: checks.json ·
Licence: open data