The Open Message Queue broker's Port Mapper — connect and it tells you which ports its JMS services really use.
Open Message Queue (formerly Sun/Oracle Message Queue, now Eclipse OpenMQ, the JMS provider bundled with GlassFish) starts its broker with imq.portmapper.port=7676 by default. The Port Mapper is a rendezvous service: a client connects to 7676, receives the broker's version and a table of its dynamically allocated service ports (jms, ssljms, admin, cluster), then connects to the one it needs. So finding 7676 open means a Java message broker is running, and the port itself hands you a map of the rest of it.
Do not expose
The Port Mapper answers before authentication and enumerates the broker's services; a message broker is backend infrastructure and belongs on a private network, not a public IP.
$ nc -w 3 TARGET 7676 | head -c 200; echoSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.