Guides
Understand, renew and troubleshoot your SSL certificates, step by step.
9 guides match “HTTPS”.
Clear search-
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: 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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Troubleshooting Reading time: 3 min
NET::ERR_CERT_DATE_INVALID error: causes and fixes
What the "Your connection is not private" error tied to the certificate date means, how to tell whether the problem is on the site or the visitor's side, and how to fix it.
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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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Tutorials Reading time: 3 min
Adding a domain to monitor
Add a domain in seconds, understand the information displayed and what happens next.
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Tutorials Reading time: 3 min
Importing multiple domains at once (CSV)
Prepare a CSV file, import it and understand the result: duplicates, plan limits and skipped rows.
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Tutorials Reading time: 4 min
Setting up your expiration alerts
Choose the channels (email, Slack, Telegram, webhook), when reminders go out and who gets them, and turn on reports.
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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.
A certificate to check right now?
The free checker shows its expiry date, issuer and covered domains.