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Understand, renew and troubleshoot your SSL certificates, step by step.
2 guides match “unable to get local issuer certificate”.
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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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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.
A certificate to check right now?
The free checker shows its expiry date, issuer and covered domains.