JMX agent not collecting JVM data for MBean server (4353016)

JMX not collecting JVM data on the "MBean Server Group" dashboard and failed with an ERROR below:

YYYY-MM-DD HH:MIN:SEC ECHO    <JMXAgent/5.9.4/JMXAgent/host-name> WARN [Quartz[0]-69667] com.quest.jmxagent.ErrorHandler - Connection to MBeanServer failed: t3://host:8512: Destination unreachable; nested exception is:
    java.net.ConnectException: Connection refused; No available router to destination
java.io.IOException
...
YYYY-MM-DD HH:MIN:SEC ECHO    <JMXAgent/5.9.4/JMXAgent/host-name> WARN [Quartz[0]-73217] com.quest.jmxagent.ErrorHandler - Connection to MBeanServer failed: ; nested exception is:
    weblogic.utils.net.SocketResetException
weblogic.rjvm.PeerGoneException: ; nested exception is:
...
Caused by: weblogic.utils.net.SocketResetException