A third-party certificate is issued for a fully qualified domain name. A third-party certificate cannot function for just a hostname or an IP address. Please enter the fully qualified domain name for which the certificate was issued into the address bar of the browser.
For example, you may have been using https://MyRapidRecoveryCore:8006/apprecovery/admin as your URL. With a self-issued certificate, your browser would not normally trust the certificate and it may have also report an error.