Guides
Understand, renew and troubleshoot your SSL certificates, step by step.
5 guides match “TLS certificate”.
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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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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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Security Reading time: 4 min
SSL/TLS security best practices
Protocols, keys, HSTS headers, redirects and certificate monitoring: the checklist for a solid HTTPS setup.
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Fundamentals Reading time: 3 min
SSL certificates: validity is dropping to 47 days
200 days in 2026, 100 days in 2027, 47 days in 2029. The timeline, what changes for Let's Encrypt and paid certificates, and how to prepare.
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Troubleshooting Reading time: 4 min
Troubleshooting the most common SSL errors
Expired certificate, name mismatch, incomplete chain, mixed content: how to identify the cause of the error and fix it.
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