A warning is displayed in the Chrome console window regarding your certificate
SHA is a popular hashing algorithm used by the majority of SSL certificates. As computing power has increased the feasibility of breaking the SHA1 hash has increased.
This usually means the implementation of SSL on your server is not correct. The error is usually caused by a server side problem which the server administrator will need to investigate.
Due to the General Data Protection Regulations (GDPR) the whois email address is no longer listed for domain validation.
Error produced by Firefox when visiting website secured by a no longer trusted certificate.