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Consider the following:
Are you using the correct protocol?
Ensure that you are using the same version of the JVM that you want to monitor as is being used by the JVM running the Java Client.
The format of the service URL is:
service:jmx:rmi:///jndi/rmi://<hostname>/jmxrmi
Are the correct ports opened?
Note that running JMX over RMI requires two ports and that one of the ports will not be known beforehand.
Is the communication caught in a firewall?
For more information, see "Java Mission Control Communications" in the Introduction to Java Mission Control on the Oracle Technology Network.