hello:

 we visit SDP 7020， OpManager 7105, in windows xp , IE6 , and sometimes when after we created a new request, in SDP,the username at up right corner became "unknown", then we cannot use SDP normally and had to relogin.

SDP is running on a clean old server, Windows Server 2003 system, OpManager is also running on it.

I checked the log, many Exception stacks output

like this were found:

[08:11:29:734]|[07-09-2009]|[SYSOUT]|[INFO]|[24]|: [JBOSS] Engine: StandardWrapperValve[default]: Servlet.service() for servlet default threw exceptioncom.adventnet.client.ClientException: State cookie is not passed along with the request. Can happen in case of  use of back button.
    at com.adventnet.client.view.web.StateParserGenerator.processState(StateParserGenerator.java:284)
    at com.adventnet.client.view.web.StateFilter.doFilter(StateFilter.java:35)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
    at com.adventnet.authentication.ContextChangeDetector.doFilter(ContextChangeDetector.java:112)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:75)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:66)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:158)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
    at com.adventnet.authentication.CredentialAssociation.invoke(CredentialAssociation.java:75)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
    at com.adventnet.client.util.LoginParameters.invoke(LoginParameters.java:53)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
    at com.adventnet.servicedesk.tools.AuthenticateNtlm.invoke(AuthenticateNtlm.java:278)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
    at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.java:444)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:535)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
    at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
    at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
    at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
    at java.lang.Thread.run(Unknown Source)

we did not use a back button in fact.\

it looks like something wrong with the cookie, we did some basic troubleshooting procedures, but the error still happens.  cookie is always enabled in our IE and no other security restrictions on cookie at all.

please help, thanks