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Understand, renew and troubleshoot your SSL certificates, step by step.
4 guides match “fullchain.pem”.
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Tutorials Reading time: 3 min
Creating a free SSL certificate with Let's Encrypt and Certbot
Install Certbot, get a certificate for Nginx or Apache, handle wildcards and make sure automatic renewal really works.
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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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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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