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SAP NetWeaver Application Server 7.10 / AS Java 7.10 Internal Server Error

i received the following error with every webdynpro application including the SAP NetWeaver Administrator or the System Information, User Administration

the following exception appears in every request to any webdynpro application

do you have any idea?

com.sap.engine.services.servlets_jsp.client.RequestInfoServer#sap.com/tcwddispwda#com.sap.engine.services.servlets_jsp.client.RequestInfoServer#J2EE_GUEST#4052##n.a.##0f1333502f9611dec4a1da6baddafd03#HTTP Worker [49]##0#0#Error##Plain###Processing HTTP request to servlet [dispatcher] finished with error. The error is: com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: Failed to retrieve client for current request. Causing exception is nested.

at com.sap.tc.webdynpro.clientserver.task.Task.getClient(Task.java:493)

at com.sap.tc.webdynpro.serverimpl.wdc.um.ClientUserFactory.checkAuthentication(ClientUserFactory.java:200)

at com.sap.tc.webdynpro.serverimpl.core.um.AbstractClientUserFactory$1.checkAuthentication(AbstractClientUserFactory.java:151)

at com.sap.tc.webdynpro.services.sal.um.api.WDClientUser.checkAuthentication(WDClientUser.java:214)

at com.sap.tc.webdynpro.clientserver.session.RequestManager.checkAuthentication(RequestManager.java:681)

at com.sap.tc.webdynpro.clientserver.session.RequestManager.doProcessing(RequestManager.java:212)

at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.delegateToRequestManager(AbstractExecutionContextDispatcher.java:205)

at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.DispatchHandlerForRequestManager.doService(DispatchHandlerForRequestManager.java:38)

at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.AbstractDispatchHandler.service(AbstractDispatchHandler.java:116)

at com.sap.engine.services.servlets_jsp.server.deploy.impl.module.IRequestDispatcherImpl.dispatch(IRequestDispatcherImpl.java:93)

at com.sap.tc.webdynpro.serverimpl.wdc.sessionctx.ExecutionContextDispatcher.dispatchToRequestManager(ExecutionContextDispatcher.java:140)

at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.dispatch(AbstractExecutionContextDispatcher.java:93)

at com.sap.tc.webdynpro.serverimpl.core.sessionctx.AbstractExecutionContextDispatcher.dispatch(AbstractExecutionContextDispatcher.java:105)

at com.sap.tc.webdynpro.serverimpl.core.AbstractDispatcherServlet.doContent(AbstractDispatcherServlet.java:87)

at com.sap.tc.webdynpro.serverimpl.core.AbstractDispatcherServlet.doGet(AbstractDispatcherServlet.java:54)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)

at com.sap.engine.services.servlets_jsp.server.Invokable.invoke(Invokable.java:66)

at com.sap.engine.services.servlets_jsp.server.Invokable.invoke(Invokable.java:32)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:431)

at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:289)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:387)

at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:376)

at com.sap.engine.services.servlets_jsp.filters.ServletSelector.process(ServletSelector.java:85)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)

at com.sap.engine.services.servlets_jsp.filters.ApplicationSelector.process(ApplicationSelector.java:160)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)

at com.sap.engine.services.httpserver.filters.WebContainerInvoker.process(WebContainerInvoker.java:67)

at com.sap.engine.services.httpserver.chain.HostFilter.process(HostFilter.java:9)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)

at com.sap.engine.services.httpserver.filters.ResponseLogWriter.process(ResponseLogWriter.java:60)

at com.sap.engine.services.httpserver.chain.HostFilter.process(HostFilter.java:9)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)

at com.sap.engine.services.httpserver.filters.DefineHostFilter.process(DefineHostFilter.java:27)

at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)

at com.sap.engine.services.httpserver.filters.MonitoringFilter.process(MonitoringFilter.java:29)

at com.sap.engine.services.httpserver.chain.ServerFilter.process(ServerFilter.java:12)

at com.sap.engine.services.httpserver.chain.AbstractChain.process(AbstractChain.java:71)

at com.sap.engine.services.httpserver.server.Processor.chainedRequest(Processor.java:309)

at com.sap.engine.services.httpserver.server.Processor$FCAProcessorThread.run(Processor.java:222)

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:152)

at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:181)

Caused by: com.sap.tc.webdynpro.services.cal.core.exceptions.WDClientException: Found no client for parameter: null, useragent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

at com.sap.tc.webdynpro.clientserver.cal.ClientInspector.findClientContainer(ClientInspector.java:217)

at com.sap.tc.webdynpro.clientserver.cal.ClientInspector.getClient(ClientInspector.java:106)

at com.sap.tc.webdynpro.clientserver.task.Task.getClient(Task.java:491)

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