Browser security errors › Firefox
SEC_ERROR_EXPIRED_CERTIFICATE: how to fix it on your website
Firefox reports that the certificate has expired, or the visitor's clock is wrong.
What your visitors see
A full-page warning in Firefox.
Common causes
- Certificate expired
- Renewal not deployed
- Visitor's system date incorrect
How to fix it
- Renew and deploy the certificate
- Automate renewal and monitoring
- Ask an individual visitor to check their clock if only they are affected
Check your certificate and TLS setup
Korrali Web scans your site for certificate, TLS and security header problems and can monitor it so you hear about expiry before visitors do.