You mention that the URL was something like this
service:jmx:rmi:///jndi/rmi://<hostname>:8686/jmxr
Try a "nmap -p 8686 <hostname>" or a "netstat -a | grep 8686" and see if something is listening.
If nothing is listening, your problem may be indirectly related to this issue
https://glassfish.dev.java.net/issues/show_bug.cgi?id=6898
Bye
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