8.2.2. A Note on Installing Client Certificates
Versions of Red Hat Enterprise Linux prior to 6.4 require a restart of the broker to load new client certificates that are added to the certificate database.
Red Hat Enterprise Linux 6.5 contains a modification that allows client certificates to be added to the database and read by the broker without restarting. This modification is available for Red Hat Enterprise Linux 6.4 as a hot fix.