We are running Pega 7.2.2 on WAS 8.5.5 and got following warning:

2018-11-29 12:19:40,930 [tzzapp0366.insim.biz] ( context.web.WebSphereNodeInfo) WARN - getNodeInfoWASV8: Exception while trying to fetch port information.
com.ibm.websphere.management.exception.ConfigServiceException: ADMN1211E: Unable to open connector to admin agent while processing method resolve for interface com.ibm.websphere.management.configservice.ConfigService
at com.ibm.wsspi.management.collaborator.AgentProxyCollaborator.mapAndThrowException(AgentProxyCollaborator.java:499)
at com.ibm.wsspi.management.collaborator.AgentProxyCollaborator.invoke(AgentProxyCollaborator.java:224)
at com.sun.proxy.$Proxy3.resolve(Unknown Source)
at com.ibm.ws.management.configservice.ConfigServiceServerProxy$14.run(ConfigServiceServerProxy.java:567)
at java.security.AccessController.doPrivileged(AccessController.java:694)
at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:125)
at com.ibm.ws.management.configservice.ConfigServiceServerProxy.resolve(ConfigServiceServerProxy.java:558)
at com.pega.pegarules.priv.context.web.WebSphereNodeInfo.getNodeInfoWASV8(WebSphereNodeInfo.java:138)
at com.pega.pegarules.priv.context.web.WebSphereNodeInfo.getNodeInfo(WebSphereNodeInfo.java:102)
at com.pega.pegarules.session.internal.mgmt.PRNodeImpl.getNodeUrl(PRNodeImpl.java:1979)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineStartup.initEngine(EngineStartup.java:702)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._initEngine_privact(EngineImpl.java:172)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl$1.run(EngineImpl.java:150)
at java.security.AccessController.doPrivileged(AccessController.java:638)
at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.doStartup(EngineImpl.java:147)
at com.pega.pegarules.session.internal.engineinterface.etier.ejb.EngineBean.doStartup(EngineBean.java:121)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:90)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:508)
at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:370)
at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:411)
at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:224)
at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingException(AppServerBridgeToPega.java:246)
at com.pega.pegarules.internal.etier.ejb.EngineBeanBoot.doStartup(EngineBeanBoot.java:130)
at com.pega.pegarules.internal.etier.interfaces.EJSLocalStatelessEngineBMT_f2439d86.doStartup(Unknown Source)
at com.pega.pegarules.web.servlet.WebAppLifeCycleListener._contextInitialized_privact(WebAppLifeCycleListener.java:317)
at com.pega.pegarules.web.servlet.WebAppLifeCycleListener$2.run(WebAppLifeCycleListener.java:227)
at java.security.AccessController.doPrivileged(AccessController.java:638)
at com.pega.pegarules.web.servlet.WebAppLifeCycleListener.contextInitialized(WebAppLifeCycleListener.java:224)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:90)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:508)
at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:370)
at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:411)
at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethodPropagatingThrowable(AppServerBridgeToPega.java:224)
at com.pega.pegarules.boot.internal.extbridge.AppServerBridgeToPega.invokeMethod(AppServerBridgeToPega.java:273)
at com.pega.pegarules.internal.web.servlet.WebAppLifeCycleListenerBoot.contextInitialized(WebAppLifeCycleListenerBoot.java:83)
at com.ibm.ws.webcontainer.webapp.WebApp.notifyServletContextCreated(WebApp.java:1734)
at com.ibm.ws.webcontainer.webapp.WebAppImpl.initialize(WebAppImpl.java:415)
at com.ibm.ws.webcontainer.webapp.WebGroupImpl.addWebApplication(WebGroupImpl.java:88)
at com.ibm.ws.webcontainer.VirtualHostImpl.addWebApplication(VirtualHostImpl.java:171)
at com.ibm.ws.webcontainer.WSWebContainer.addWebApp(WSWebContainer.java:904)
at com.ibm.ws.webcontainer.WSWebContainer.addWebApplication(WSWebContainer.java:789)
at com.ibm.ws.webcontainer.component.WebContainerImpl.install(WebContainerImpl.java:427)
at com.ibm.ws.webcontainer.component.WebContainerImpl.start(WebContainerImpl.java:719)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:1211)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeployedObjectStart(DeployedApplicationImpl.java:1390)
at com.ibm.ws.runtime.component.DeployedModuleImpl.start(DeployedModuleImpl.java:639)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:979)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:795)
at com.ibm.ws.runtime.component.ApplicationMgrImpl$5.run(ApplicationMgrImpl.java:2279)
at com.ibm.ws.security.auth.ContextManagerImpl.runAs(ContextManagerImpl.java:5554)
at com.ibm.ws.security.auth.ContextManagerImpl.runAsSystem(ContextManagerImpl.java:5680)
at com.ibm.ws.security.core.SecurityContext.runAsSystem(SecurityContext.java:255)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:2284)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:436)
at com.ibm.ws.runtime.component.CompositionUnitImpl.start(CompositionUnitImpl.java:123)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:379)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.access$500(CompositionUnitMgrImpl.java:127)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl$CUInitializer.run(CompositionUnitMgrImpl.java:985)
at com.ibm.wsspi.runtime.component.WsComponentImpl$_AsynchInitializer.run(WsComponentImpl.java:524)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1892)
Caused by:
com.ibm.websphere.management.exception.ConnectorNotAvailableException
at com.ibm.ws.management.RoutingTable.getParent(RoutingTable.java:243)
at com.ibm.wsspi.management.collaborator.AgentProxyCollaborator.initialize(AgentProxyCollaborator.java:296)
at com.ibm.wsspi.management.collaborator.AgentProxyCollaborator.invoke(AgentProxyCollaborator.java:211)
... 62 more

Any one who knows how to get ride of this warning?