Google: meaning certificate not secure
“The following warnings are presented by web browsers when you access a site that has a security certificate installed (for SSL/TLS data encryption) that cannot be verified by the browser. … If this is the case, the browser will warn you that the Certificate Authority (CA) who issued the certificate is not trusted.”
“Certificates are proof of identify. When you see the SSL padlock in the browser’s address bar or at the bottom of the browser it means that a secure connection between your browser and the website has been established. … This warning appears when the website is using an invalid SSL certificate.”
I’ll send this over to tech.