This property specifies the port on which the vCenter Hyperic server the Java virtual machine listens for JMX requests, if JMX is enabled.

By default, JMX is disabled. The property that controls whether or not JMX is enabled is server.jms.usejmx.

The primary reason to enable JMX is to enable monitoring of the vCenter Hyperic server's internal ActiveMQ server. With the port closed, a vCenter Hyperic agent on the same platform as the vCenter Hyperic server will discover ActiveMQ, but cannot obtain ActiveMQ metrics.