Cannot disable TLS versions earlier than 1.2 to only use version 1.2 with the Tomcat 8443 connector.
SEP 12.1
This issue is resolved in Symantec Endpoint Protection (SEP) 14. For more information on upgrading, please see Upgrade or migrate to Endpoint Protection 14
Starting with SEP 14 TLSv1.2 will be used for ports 8443 and 8446.