Failed to retrieve RMIServer stub ... non-JRMP server at remote endpoint when trying to connect to JBoss EAP 6 JMX

Issue

• We are getting the error on remote monitoring access to JBoss EAP 6 via JMX :

Failed to retrieve RMIServer stub: javax.naming.CommunicationException [Root exception is java.rmi.ConnectIOException: non-JRMP server at remote endpoint]

or:

| ERROR| App | Cannot connect to instance localhost:7199 java.io.IOException: Failed to retrieve RMIServer stub: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
        java.net.ConnectException: Connection refused]