SSL certificates expire after a set period. If a certificate is close to expiry or already expired, browsers may show warnings and users may lose trust in the site.
An expired certificate can trigger browser warnings, reduce trust, interrupt logins or payments, and hurt the reliability of a website or application.
Expiry checks are useful before renewals, after installing a new certificate, during audits, or when diagnosing browser trust warnings.
Look at the certificate validity period and expiry date. If the certificate is close to expiry, renew or replace it before it causes trust issues.
Common issues include failed auto-renewal, installing a renewed certificate on the wrong server, incomplete chains, and forgetting to restart services after renewal.
Once you understand what to look for, run a live check using the tool below.
Launch SSL CheckerBrowsers may show security warnings and users may no longer trust the site.
It is wise to check regularly, especially before the expected renewal window.
This page explains the purpose of the check, what results mean, and what problems to watch for before you run the live tool.
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