"java.io.IOException: connection closed" error in

In the stdout.log file, there were many such errors. It seems to be connection issue with the LDAP server, but we have not noticed any logon issue (we only have a few users at this monent).

Any idea about this error? Thanks.

Jul 1, 2008 11:22:59 AM org.apache.catalina.realm.JNDIRealm authenticate
WARNING: Exception performing authentication
javax.naming.CommunicationException: connection closed ; remaining name 'ou=people,dc=dir,dc=svc,dc=xxxx,dc=com'
at com.sun.jndi.ldap.LdapCtx.doSearch(LdapCtx.java:1976)
at com.sun.jndi.ldap.LdapCtx.searchAux(LdapCtx.java:1821)
at com.sun.jndi.ldap.LdapCtx.c_search(LdapCtx.java:1746)
at com.sun.jndi.toolkit.ctx.ComponentDirContext.p_search(ComponentDirContext.java:383)
at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.search(PartialCompositeDirContext.java:353)
at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.search(PartialCompositeDirContext.java:336)
at javax.naming.directory.InitialDirContext.search(InitialDirContext.java:259)
at org.apache.catalina.realm.JNDIRealm.getUserBySearch(JNDIRealm.java:1051)
at org.apache.catalina.realm.JNDIRealm.getUser(JNDIRealm.java:959)
at org.apache.catalina.realm.JNDIRealm.authenticate(JNDIRealm.java:908)
at org.apache.catalina.realm.JNDIRealm.authenticate(JNDIRealm.java:809)
at org.apache.catalina.authenticator.FormAuthenticator.authenticate(FormAuthenticator.java:258)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:417)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
at java.lang.Thread.run(Thread.java:810)
Caused by: java.io.IOException: connection closed
at com.sun.jndi.ldap.LdapClient.ensureOpen(LdapClient.java:1573)
at com.sun.jndi.ldap.LdapClient.search(LdapClient.java:519)
at com.sun.jndi.ldap.LdapCtx.doSearch(LdapCtx.java:1959)
... 22 more