The ActiveMQ port is set by default during the installation to TCP 61616 this port can be changed after the installation by modifying the file jms.properties
On the NAC the file location is:
<RA Root>/webapps/<datamanagement>
And on the execution servers:
<RA Root>/webapps/<execution>/WEB_INF
To change the port modify the value “jms.transport.port=61616” to a new unused port and once the port has been changed the NAC and all Execution servers should be restarted