InformationClient-cert authentication requires that each client connecting to the server have a certificate to authenticate. This is generally regarded as stronger authentication than a password as it requires the client to have the certificate and not just know a password.
Certificate based authentication is more secure than password based authentication.
SolutionIn the Connector element, set the clientAuth parameter to true and the certificateVerification to required
<-- Define a SSL Coyote HTTP/1.1 Connector on port 8443 -->
port='8443' minProcessors='5' maxProcessors='75'
acceptCount='100' debug='0' scheme='https' secure='true';