The Active MQ module is used for real-time communication between Administration Console and Access Gateway Service. Real-time communication is needed for commands such as purging cache, gathering statistics, and updating health. Figure 33-3 illustrates this communication flow.
Figure 33-3 Real-Time Communication
When the ActiveMQ module fails to start, you cannot apply any configuration changes, and Access Gateway does not set a listener for the configured port.
To start the module, it must be able to resolve the listening IP address to a DNS name. To install Access Gateway Service, the machine must have a DNS name, and the IP address must resolve to this name.