Hi,

i have a Pega 8.4 installation. I am constantly getting the below error in the log file (even when the NodeType is WebUser or Stream or RealTime).

08:03:39,309 WARN  [com.pega.dsm.dnode.api.prpc.service.monitoring.MbeanRegister] (DSM init service: DataFlow.RealTime) Failed to initialize MBean for service DataFlow.RealTime: javax.management.InstanceAlreadyExistsException: com.pega.PegaRULES.open:type=web,name=com.pega.dsm.dnode.api.prpc.service.monitoring.MBeanDSMService,id="DataFlow.RealTime"         at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437) [rt.jar:1.8.0_102]         at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898) [rt.jar:1.8.0_102]         at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966) [rt.jar:1.8.0_102]         at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900) [rt.jar:1.8.0_102]         at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324) [rt.jar:1.8.0_102]         at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522) [rt.jar:1.8.0_102]         at org.jboss.as.jmx.PluggableMBeanServerImpl$TcclMBeanServer.registerMBean(PluggableMBeanServerImpl.java:1441)         at org.jboss.as.jmx.PluggableMBeanServerImpl.registerMBean(PluggableMBeanServerImpl.java:839)         at com.pega.dsm.dnode.api.prpc.service.monitoring.MbeanRegister.register(MbeanRegister.java:71) [d-node.jar:]         at com.pega.dsm.dnode.impl.prpc.service.health.ServiceHealthCheckRegistration.registerMbean(ServiceHealthCheckRegistration.java:69) [d-node.jar:]         at com.pega.dsm.dnode.impl.prpc.service.health.ServiceHealthCheckRegistration.registerGenericServiceHealthCheck(ServiceHealthCheckRegistration.java:64) [d-node.jar:]         at com.pega.dsm.dnode.impl.prpc.service.ServiceDefinition.start(ServiceDefinition.java:67) [d-node.jar:]         at com.pega.dsm.dnode.api.prpc.service.ServiceManager.initializeClientService(ServiceManager.java:306) [d-node.jar:]         at com.pega.dsm.dnode.api.prpc.service.ServiceManager.access$000(ServiceManager.java:82) [d-node.jar:]         at com.pega.dsm.dnode.api.prpc.service.ServiceManager$1.run(ServiceManager.java:289) [d-node.jar:]         at com.pega.dsm.dnode.api.prpc.service.ServiceManager$1.run(ServiceManager.java:286) [d-node.jar:]         at com.pega.dsm.dnode.util.PrpcRunnable.execute(PrpcRunnable.java:67) [d-node.jar:]         at com.pega.dsm.dnode.impl.prpc.service.ServiceHelper.executeInPrpcContextInternal(ServiceHelper.java:301) [d-node.jar:]         at com.pega.dsm.dnode.impl.prpc.service.ServiceHelper.executeInPrpcContext(ServiceHelper.java:146) [d-node.jar:]         at com.pega.dsm.dnode.api.prpc.service.ServiceManager.initializeClientService(ServiceManager.java:286) [d-node.jar:]         at com.pega.dsm.dnode.api.prpc.service.ServiceManager.getService(ServiceManager.java:254) [d-node.jar:]         at com.pega.dsm.dnode.impl.aggregation.service.MasterNodeExecutorImpl.serviceActive(MasterNodeExecutorImpl.java:112) [cep-engine.jar:]         at com.pega.dsm.dnode.impl.aggregation.service.MasterNodeExecutorImpl.dependentServicesAvailable(MasterNodeExecutorImpl.java:104) [cep-engine.jar:]         at com.pega.dsm.dnode.impl.aggregation.service.MasterNodeExecutorImpl.executeOnMaster(MasterNodeExecutorImpl.java:86) [cep-engine.jar:]         at com.pega.dsm.dnode.impl.aggregation.service.operation.AggregatesPulseOperation.emit(AggregatesPulseOperation.java:94) [cep-engine.jar:]         at com.pega.dsm.dnode.impl.stream.DataObservableImpl$SafeDataSubscriber.subscribe(DataObservableImpl.java:353) [d-node.jar:]         at com.pega.dsm.dnode.impl.stream.DataObservableImpl.subscribe(DataObservableImpl.java:55) [d-node.jar:]         at com.pega.dsm.dnode.impl.stream.DataObservableImpl.await(DataObservableImpl.java:117) [d-node.jar:]         at com.pega.dsm.dnode.impl.stream.DataObservableImpl.await(DataObservableImpl.java:106) [d-node.jar:]         at com.pega.dsm.dnode.impl.prpc.service.health.ServiceHealthCheckRegistration$1.run(ServiceHealthCheckRegistration.java:122) [d-node.jar:]         at com.pega.dsm.dnode.impl.prpc.service.health.ServiceHealthCheckRegistration$1.run(ServiceHealthCheckRegistration.java:113) [d-node.jar:]         at com.pega.dsm.dnode.util.PrpcRunnable.execute(PrpcRunnable.java:67) [d-node.jar:]         at com.pega.dsm.dnode.impl.prpc.service.ServiceHelper.executeInPrpcContextInternal(ServiceHelper.java:301) [d-node.jar:]         at com.pega.dsm.dnode.impl.prpc.service.ServiceHelper.executeInPrpcContext(ServiceHelper.java:146) [d-node.jar:]         at com.pega.dsm.dnode.impl.prpc.service.health.ServiceHealthCheckRegistration.lambda$registerPulseExecutor$0(ServiceHealthCheckRegistration.java:113) [d-node.jar:]         at com.google.common.util.concurrent.MoreExecutors$ScheduledListeningDecorator$NeverSuccessfulListenableFutureTask.run(MoreExecutors.java:656) [guava-19.0.jar:]         at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [rt.jar:1.8.0_102]         at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [rt.jar:1.8.0_102]         at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [rt.jar:1.8.0_102]         at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [rt.jar:1.8.0_102]         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_102]         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_102]         at com.pega.dsm.dnode.util.PrpcRunnable$1.run(PrpcRunnable.java:59) [d-node.jar:]         at com.pega.dsm.dnode.util.PrpcRunnable$1.run(PrpcRunnable.java:56) [d-node.jar:]         at com.pega.dsm.dnode.util.PrpcRunnable.execute(PrpcRunnable.java:67) [d-node.jar:]         at com.pega.dsm.dnode.impl.prpc.PrpcThreadFactory$PrpcThread.run(PrpcThreadFactory.java:124) [d-node.jar:]