We are getting this error while connecting to the node from the SMA, Below are the details of the error and the stack trace.

MSG:

Cannot connect to the server with specified settings
Failed to retrieve RMIServer stub: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: kbjer9321; nested exception is: java.net.ConnectException: Connection refused: connect]

Stack Trace:

				    com.pega.jmx.ui.util.JMXClientException: Cannot connect to the server with specified settings 
Failed to retrieve RMIServer stub: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: kbjer9321; nested exception is: 
	java.net.ConnectException: Connection refused: connect]
	at com.pega.jmx.ui.util.JMXClientException.wrap(JMXClientException.java:49)
	at com.pega.jmx.ui.action.AuthenticateAction.execute(AuthenticateAction.java:302)
	at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1480)
	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:506)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1813)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.Exception: Cannot connect to the server with specified settings 
Failed to retrieve RMIServer stub: javax.naming.ServiceUnavailableException [Root exception is java.rmi.ConnectException: Connection refused to host: kbjer9321; nested exception is: 
	java.net.ConnectException: Connection refused: connect]
	at com.pega.jmx.connection.managenodes.GenericJMXRemoteConnection.acquireConnection(GenericJMXRemoteConnection.java:64)
	at com.pega.jmx.connection.managenodes.Node.getMBeanServerConnection(Node.java:405)
	at com.pega.jmx.ui.action.AuthenticateAction.execute(AuthenticateAction.java:142)
	... 22 more

Thanks.