a) You are trying to access the website using IP address. Hence using the FQDN.
b) You have multiple websites running on Webserver, but mistakenly all are pointing to same Port. Hence try to access the website and put the specific port number where you have binded the certificate.
c) You have multiple websites using One IP address. Hence please check if you can use dedicated IP address for each website or check if SNI is enabled and supported by the server.
d) The certificate was issued to domain.com, but www.domain.com was typed into the. browser
Technically, you can procure SAN certificate or Wild Card certificate which will secure multi –domains and multi sub domains respectively in order to take care of the above error.
