Guides
Understand, renew and troubleshoot your SSL certificates, step by step.
5 guides match “SSL error”.
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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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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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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: 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: 3 min
Adding a domain to monitor
Add a domain in seconds, understand the information displayed and what happens next.
A certificate to check right now?
The free checker shows its expiry date, issuer and covered domains.