Errors / Network errors
net::ERR_CERT_DATE_INVALID
The site's security certificate has expired.
Every visitor gets a warning page, or a missing resource if it is a subdomain.
Why it happens
- Automatic renewal failed: a changed DNS record, a blocked challenge, a stopped cron job.
- A certificate bought for a year and forgotten.
- Rarely, the visitor's clock is wrong.
How to fix it
- Renew it, then find out why renewal failed so it does not happen again.
- Monitor certificate expiry, for every host the site loads from.
- Read the dates on the certificate from the padlock in the address bar: an expiry in the past is the site; dates that look valid while the error persists point at the visitor's clock, a common cause on phones and old laptops with a dead battery. A certificate that expired on one server behind a load balancer shows for some visitors and not others.
Whose problem it is
Usually the server that answers the request.
Does your site have it?
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Often seen with
- ERR_CERT_AUTHORITY_INVALIDThe site's security certificate was not issued by anyone the browser trusts.