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Sec error expired certificate

From MozillaZine Knowledge Base

When you try to visit a website that is loaded over a secure connection, you may see a SEC_ERROR_EXPIRED_CERTIFICATE error. This error means the connection is not secure and has been aborted by Firefox because the digital certificate that the server is using is passed its valid date. It could also mean that your computer's clock is not correct and is set to a date in the future.

Error message

On Firefox 60 you will see the following message and the detailed message after clicking on the "Advanced" button:

Image:SEC_ERROR_EXPIRED_CERTIFICATE_2.png

See also