Website URL https://wb.cameron.free.nf/HRRC/Card_1/
(please specify the URL of the site on which you are experiencing the problem)
Error Message Your connection is not private
Attackers might be trying to steal your information from wb.cameron.free.nf (for example, passwords, messages, or credit cards). Learn more about this warning
NET::ERR_CERT_AUTHORITY_INVALID
(please share the FULL error message you see, if applicable)
Other Information This used to work perfectly but now I cannot access what’s on that site. If I change the URL from: https:// to: http:// then it CAN connect to the site, 
(other information and details relevant to your question) The SSL certificate for the sub-subdomain (wb.cameron.free.nf) is valid and active but doesn’t appear to be covering this site within it (or its sister site whose URL ends: “/Card_2/”. However, another site within this sub-subdomain (https://www.wb.cameron.free.nf/Jim.Farmer/mobile/index.html) does work perfectly!
Can anyone explain or help. please?