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Understand, renew and troubleshoot your SSL certificates, step by step.
2 guides match “notAfter”.
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Tutorials Reading time: 2 min
Checking an SSL certificate's expiration date
Four ways to find a certificate's expiration date: browser, online tool, OpenSSL and the file on the server.
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Fundamentals Reading time: 4 min
Understanding SSL/TLS certificates
What an SSL certificate really is, what it contains, who issues it, and why it always ends up expiring.
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The free checker shows its expiry date, issuer and covered domains.