This is described here. Java Management Extensions (JMX) has changed since I first used it. It no longer needs its own port, but can use one of the configured ports.
I then used the URL https://10.1.1.2:8443/IBMJMXConnectorREST/api (for Zowe) in my browser and it gave
I also used CURL, but because the response it html – it is easier to see in a browse.
ColinPaice 