错误日志：
2015-11-14 00:49:19,371 [HTTPThreadGroup-7] WARN  jdbc.ConnectionCache _getConnection.353 - Got a fatal exeption when getting a connection; Error code = 17002; Cleaning up cache and retrying
2015-11-14 00:49:21,611 [HTTPThreadGroup-6] ERROR eml.OMSHandshake processFailure.806 - OMSHandshake failed.(AGENT URL = https://zyf.com:3938/emd/main)(ERROR = INTERNAL_ERROR)(CAUSE =java.sql.SQLException: Io exception: Socket read timed out)
2015-11-14 00:49:21,673 [HTTPThreadGroup-5] ERROR conn.ConnectionService verifyRepositoryEx.891 - Invalid Connection Pool. ERROR = Io exception: Socket read timed out
2015-11-14 00:49:34,392 [HTTPThreadGroup-7] ERROR conn.ConnectionService verifyRepositoryEx.891 - Invalid Connection Pool. ERROR = Io exception: Socket read timed out
2015-11-14 00:49:36,630 [HTTPThreadGroup-4] WARN  jdbc.ConnectionCache _getConnection.352 - Io exception: Socket read timed out
java.sql.SQLException: Io exception: Socket read timed out
        at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:77)
        at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:111)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:174)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:230)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:501)
        at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:436)
        at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:621)
        at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:203)
        at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:34)
        at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:492)
        at oracle.jdbc.pool.OracleDataSource.getPhysicalConnection(OracleDataSource.java:386)
        at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:276)
        at oracle.jdbc.pool.OracleConnectionPoolDataSource.getPhysicalConnection(OracleConnectionPoolDataSource.java:212)
        at oracle.jdbc.pool.OracleConnectionPoolDataSource.getPooledConnection(OracleConnectionPoolDataSource.java:140)
        at oracle.jdbc.pool.OracleImplicitConnectionCache.makeCacheConnection(OracleImplicitConnectionCache.java:1752)
        at oracle.jdbc.pool.OracleImplicitConnectionCache.makeOneConnection(OracleImplicitConnectionCache.java:644)
        at oracle.jdbc.pool.OracleImplicitConnectionCache.getCacheConnection(OracleImplicitConnectionCache.java:592)
        at oracle.jdbc.pool.OracleImplicitConnectionCache.getConnection(OracleImplicitConnectionCache.java:460)
        at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:544)
        at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:480)
        at oracle.sysman.util.jdbc.ConnectionCache._getConnection(ConnectionCache.java:336)
        at oracle.sysman.util.jdbc.ConnectionCache._getConnection(ConnectionCache.java:322)
        at oracle.sysman.util.jdbc.ConnectionCache.getUnwrappedConnection(ConnectionCache.java:575)
        at oracle.sysman.emSDK.svc.conn.FGAConnectionCache.getFGAConnection(FGAConnectionCache.java:207)
        at oracle.sysman.emSDK.svc.conn.ConnectionService.getPrivateConnection(ConnectionService.java:1138)
        at oracle.sysman.emSDK.svc.conn.ConnectionService.getPrivateConnection(ConnectionService.java:1172)
        at oracle.sysman.emdrep.receiver.OMSHandshake.getParameterFromDB(OMSHandshake.java:570)
        at oracle.sysman.emdrep.receiver.OMSHandshake.getMaxAgentCompatVer(OMSHandshake.java:552)
        at oracle.sysman.emdrep.receiver.OMSHandshake.handshake(OMSHandshake.java:1033)
        at oracle.sysman.emdrep.receiver.OMSHandshake.handshake(OMSHandshake.java:836)
        at oracle.sysman.emdrep.receiver.JobReceiver.doPost(JobReceiver.java:552)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
        at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:64)
        at oracle.sysman.eml.app.ContextInitFilter.doFilter(ContextInitFilter.java:327)
        at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:623)
        at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:370)
        at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:871)
        at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:453)
        at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:221)
        at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:122)
        at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:111)
        at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
        at oracle.oc4j.network.ServerSocketAcceptHandler.procClientSocket(ServerSocketAcceptHandler.java:234)
        at oracle.oc4j.network.ServerSocketAcceptHandler.access$700(ServerSocketAcceptHandler.java:29)
        at oracle.oc4j.network.ServerSocketAcceptHandler$AcceptHandlerHorse.run(ServerSocketAcceptHandler.java:879)
        at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
        at java.lang.Thread.run(Thread.java:595)
2015-11-14 00:49:36,631 [HTTPThreadGroup-4] WARN  jdbc.ConnectionCache _getConnection.353 - Got a fatal exeption when getting a connection; Error code = 17002; Cleaning up cache and retrying

请教高手

补充内容 (2015-11-15 13:46):
CenOs6.6 + llinux.x64_11gR2_database 系统和em重建好几次一样报错：

2015-11-15 14:17:00,849 [OC4J Launcher] ERROR app.ContextInitializer contextInitialized.420 - Integration Class not f...

2015-11-15 14:17:00,849 [OC4J Launcher] ERROR app.ContextInitializer contextInitialized.420 - Integration Class not found: oracle.sysman.emCLI.CLIIntg
2015-11-15 14:17:00,851 [OC4J Launcher] ERROR app.ContextInitializer contextInitialized.420 - Integration Class not found: oracle.sysman.emCLI.CLIDownloadIntg
2015-11-15 14:17:00,852 [OC4J Launcher] ERROR app.ContextInitializer contextInitialized.420 - Integration Class not found: oracle.sysman.pp.paf.sample.ui.intg.PAFDemoIntegration
2015-11-15 14:17:00,891 [OC4J Launcher] ERROR app.ContextInitializer contextInitialized.420 - Integration Class not found: oracle.sysman.pp.asprov.ui.intg.ASProvisioningIntegration
2015-11-15 14:17:01,874 [OC4J Launcher] ERROR app.ContextInitializer contextInitialized.420 - Integration Class not found: oracle.sysman.eml.target.slb.common.SLBIntegration
2015-11-15 14:17:02,699 [OC4J Launcher] ERROR app.ContextInitializer contextInitialized.420 - Integration Class not found: oracle.sysman.pp.sidb.ui.intg.SIDBProvisioningIntegration
2015-11-15 14:17:02,865 [OC4J Launcher] ERROR app.ContextInitializer contextInitialized.420 - Integration Class not found: oracle.sysman.pp.racprov.ui.intg.RACProvIntegration
2015-11-15 14:17:02,866 [OC4J Launcher] ERROR app.ContextInitializer contextInitialized.420 - Integration Class not found: oracle.sysman.pp.ec.ui.intg.ExtendClusterIntegration
2015-11-15 14:17:02,867 [OC4J Launcher] ERROR app.ContextInitializer contextInitialized.420 - Integration Class not found: oracle.sysman.pp.dn.ui.intg.DltNodeIntegration
2015-11-15 14:17:02,868 [OC4J Launcher] ERROR app.ContextInitializer contextInitialized.420 - Integration Class not found: oracle.sysman.pp.common.ui.intg.ProvCommonIntegration
2015-11-15 14:17:02,869 [OC4J Launcher] ERROR app.ContextInitializer contextInitialized.420 - Integration Class not found: oracle.sysman.pp.bpelprov.ui.intg.BPELProvisioningIntegration
2015-11-15 14:17:17,894 [PAFStartupThread] WARN  jdbc.ConnectionCache _getConnection.352 - Io exception: Socket read timed out
java.sql.SQLException: Io exception: Socket read timed out
        at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:77)
        at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:111)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:174)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:230)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:501)
        at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:436)
        at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:621)
        at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:203)
        at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:34)
        at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:492)
        at oracle.jdbc.pool.OracleDataSource.getPhysicalConnection(OracleDataSource.java:386)
        at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:276)
        at oracle.jdbc.pool.OracleConnectionPoolDataSource.getPhysicalConnection(OracleConnectionPoolDataSource.java:212)
        at oracle.jdbc.pool.OracleConnectionPoolDataSource.getPooledConnection(OracleConnectionPoolDataSource.java:140)
        at oracle.jdbc.pool.OracleImplicitConnectionCache.makeCacheConnection(OracleImplicitConnectionCache.java:1752)
        at oracle.jdbc.pool.OracleImplicitConnectionCache.makeOneConnection(OracleImplicitConnectionCache.java:644)
        at oracle.jdbc.pool.OracleImplicitConnectionCache.getCacheConnection(OracleImplicitConnectionCache.java:592)
        at oracle.jdbc.pool.OracleImplicitConnectionCache.getConnection(OracleImplicitConnectionCache.java:460)
        at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:544)
        at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:480)
        at oracle.sysman.util.jdbc.ConnectionCache._getConnection(ConnectionCache.java:336)
        at oracle.sysman.util.jdbc.ConnectionCache._getConnection(ConnectionCache.java:322)
        at oracle.sysman.util.jdbc.ConnectionCache.getUnwrappedConnection(ConnectionCache.java:575)
        at oracle.sysman.emSDK.svc.conn.FGAConnectionCache.getFGAConnection(FGAConnectionCache.java:207)
        at oracle.sysman.emSDK.svc.conn.ConnectionService.getSystemConnection(ConnectionService.java:1383)
        at oracle.sysman.pp.paf.impl.PAFDepot.createRepositoryConnectionImpl(PAFDepot.java:384)
        at oracle.sysman.pp.paf.impl.PAFDepot.startup(PAFDepot.java:463)
        at oracle.sysman.pp.paf.impl.PAFStartupThread.run(PAFStartupThread.java:45)

补充内容 (2015-11-15 16:26):
系统自带的估计有问题，现在重新下载Oracle Enterprise Manager 11g Grid Control 第 1 版 (11.1.0.1.0)，打算重新安装

自己结贴  em重新建一下就ok了 至于这个错误 到现在没搞明白，估计是在访问oracle数据库的时候时间运行时间太长，没有返回结果的原因吧。