Hi All, I have setup a system with Oracle Database 11g 11.2.0.1.0 and I am experiencing some strange behaviour. After startup when only the scheduled events are generating activity the following error appears often (due to those scheduled events): JDBCDataStore::execRetrieveQuery failed with SQLState: 08000, error code: 17410, message: Geen gegevens meer te lezen vanuit socket. Stacktrace: java.sql.SQLRecoverableException: Geen gegevens meer te lezen vanuit socket. at oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1157) at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:290) at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:192) at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531) at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:207) at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:884) at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1167) at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1289) at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3584) at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3628) at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1493) at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96) at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96) at H.a(SourceFile:318) at H.a(SourceFile:214) at H.a(SourceFile:164) at H.a(SourceFile:153) at z.a(SourceFile:41) at dA.a(SourceFile:199) at dA.a(SourceFile:157) at dA.a(SourceFile:85) at dE.a(SourceFile:68) at x.a(SourceFile:43) at h.a(SourceFile:269) at hu.b(SourceFile:126) at hu.a(SourceFile:67) at hq.a(SourceFile:61) at hq.executeAction(SourceFile:21) at com.mendix.systemwideinterfaces.core.UserAction.execute(SourceFile:57) at com.mendix.core.actionmanagement.CoreAction.call(SourceFile:457) at hC.b(SourceFile:182) at com.mendix.core.Core.retrieveXPathQuery(SourceFile:1017) at lJ.b(SourceFile:130) at lJ.a(SourceFile:84) at mh.a(SourceFile:73) at mg.executeAction(SourceFile:101) at com.mendix.systemwideinterfaces.core.UserAction.execute(SourceFile:57) at com.mendix.core.actionmanagement.CoreAction.call(SourceFile:457) at hC.b(SourceFile:182) at com.mendix.core.Core.executeSync(SourceFile:196) at lj.a(SourceFile:70) at mh.a(SourceFile:73) at mg.executeAction(SourceFile:101) at com.mendix.systemwideinterfaces.core.UserAction.execute(SourceFile:57) at com.mendix.core.actionmanagement.CoreAction.call(SourceFile:457) at hC.b(SourceFile:182) at com.mendix.core.Core.executeSync(SourceFile:196) at lN.a(SourceFile:65) at mh.a(SourceFile:73) at mg.executeAction(SourceFile:101) at com.mendix.systemwideinterfaces.core.UserAction.execute(SourceFile:57) at com.mendix.core.actionmanagement.CoreAction.call(SourceFile:457) at hC.b(SourceFile:182) at com.mendix.core.Core.execute(SourceFile:219) at hH.c(SourceFile:147) at hH.run(SourceFile:109) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:98) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) This error is followed by the following message Trying to clean up and reset connection pooling mechanism... Which leads to: Error on closing corrupt JDBC connection. And then it all starts again and again and again. Any ideas on how to solve this? Google did not help me to find a solution. Thanks, Bart