急救！！aix6.1+welogic9.2服务死掉的问题 请高手指点！！！

在aix6.1上安装welogic9.2，应用程序部署后刚开始运行都很正常，但运行一段时间后所部属的程序就无法访问了，并且连weblogic控制台都无法访问，用ps -ef|grep weblogic查看weblogic进程依然存在

weblogic日志内容：

####<May 13, 2009 6:15:23 PM GMT+08:00> <Warning> <JDBC> <node2> <AdminServer> <[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1242209723023> <BEA-001129> <Received exception while creating connection for pool "JDBC Data Source-0": Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
The Connection descriptor used by the client was:
10.8.90.237:1521:fssr2

####<May 13, 2009 3:58:20 PM GMT+08:00> <Warning> <JDBC> <node2> <AdminServer> <[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)'> <<WLS Kernel>> <> <> <1242201500743> <BEA-001129> <Received exception while creating connection for pool "JDBC Data Source-0": Io exception: The Network Adapter could not establish the connection>

####<May 13, 2009 3:58:50 PM GMT+08:00> <Notice> <WebLogicServer> <node2> <AdminServer> <Thread-2> <<WLS Kernel>> <> <> <1242201530473> <BEA-000388> <JVM called WLS shutdown hook. The server will force shutdown now>
####<May 13, 2009 3:58:50 PM GMT+08:00> <Alert> <WebLogicServer> <node2> <AdminServer> <Thread-2> <<WLS Kernel>> <> <> <1242201530473> <BEA-000396> <Server shutdown has been requested by <WLS Kernel>>

####<May 13, 2009 3:58:50 PM GMT+08:00> <Notice> <WebLogicServer> <node2> <AdminServer> <Thread-2> <<WLS Kernel>> <> <> <1242201530475> <BEA-000365> <Server state changed to FORCE_SUSPENDING>
####<May 13, 2009 3:58:50 PM GMT+08:00> <Notice> <WebLogicServer> <node2> <AdminServer> <Thread-2> <<WLS Kernel>> <> <> <1242201530483> <BEA-000365> <Server state changed to ADMIN>
####<May 13, 2009 3:58:50 PM GMT+08:00> <Notice> <WebLogicServer> <node2> <AdminServer> <Thread-2> <<WLS Kernel>> <> <> <1242201530483> <BEA-000365> <Server state changed to FORCE_SHUTTING_DOWN>