Dear All,
We have portal system with ECC backend system connected using JCO destinations. All JCO destinations are registered in central SLD (SOLMAN).
So the communication to ECC system from EP system will be via central SLD (SOLMAN).
We are intermittently getting 500 Internal error in portal while accessing ESS and MSS pages.
Below is error message and server0 defaulttrace file. Requesting you to suggest on the same.

Below is the defaulttrace file message.
#2 07/22/2016 11:14:19.404 [SAPEngine_Application_Thread[impl:3]_42] ERROR com.sap.lcr.webui.DPClientView: Could not retrieve local namespaces
Thrown:
com.sap.sld.api.wbem.exception.CIMException: CIM_ERR_INVALID_CLASS: No such class: CIM_Namespace
at com.sap.lcr.objmgr.requests.WBEM_Request.getClass(WBEM_Request.java:173)
at com.sap.lcr.objmgr.requests.WBEMEnumerateInstanceNames.execute(WBEMEnumerateInstanceNames.java:45)
at com.sap.lcr.objmgr.requests.WBEM_ReadRequest.execute(WBEM_ReadRequest.java:50)
at com.sap.lcr.objmgr.core.ObjectManager.executeImpl(ObjectManager.java:1322)
at com.sap.lcr.objmgr.core.ObjectManager.execute(ObjectManager.java:1236)
at com.sap.lcr.objmgr.core.ObjectManager.enumerateInstanceNames(ObjectManager.java:766)
at com.sap.lcr.cimsrv.WBEMLocalClient.enumerateInstanceNamesNoSubclassesImpl(WBEMLocalClient.java:517)
at com.sap.sld.api.wbem.client.WBEMClient.enumerateNamespaces(WBEMClient.java:3317)
at com.sap.lcr.webui.DPClientView.getHTML(DPClientView.java:98)
at jsp_index1469166256952._jspService(jsp_index1469166256952.java:29)
at com.sap.engine.services.servlets_jsp.server.jsp.JspBase.service(JspBase.java:112)
at com.sap.engine.services.servlets_jsp.server.servlet.JSPServlet.service(JSPServlet.java:566)
at com.sap.engine.services.servlets_jsp.server.servlet.JSPServlet.service(JSPServlet.java:190)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.runtime.RequestDispatcherImpl.doWork(RequestDispatcherImpl.java:321)
at com.sap.engine.services.servlets_jsp.server.runtime.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:377)
at com.sap.lcr.webui.Tool.gotoURL(Tool.java:1374)
at com.sap.lcr.webui.ListServlet.gotoView(ListServlet.java:249)
at com.sap.lcr.webui.ListServlet.doGet(ListServlet.java:100)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:401)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:266)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:386)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:364)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:1060)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:265)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:95)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:175)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:104)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:176)
Regards,
Zahir Hussain