Agent Connection unavailable

I have a test 10g r2 server on a RHEL3 box. This morning when I login in, either by sys or a DBA user, the status of Agent Connection was down, but the instance was open and listener was OK. So I dbshut and dbstart the db and stop/start the dbconsole. then the status is OK again. Does anyone know why? checked some log and trc files , indicating that error in uploadXMLFiles.
Chi

I cut off from Last Friday before I left the office till the time I correct the problem
2006-08-04 09:52:06 Thread-31075248 ERROR upload: Error in uploadXMLFiles. Trying again in 60.00 seconds.
2006-08-04 09:53:07 Thread-106531760 ERROR util.files: nmeufile_getLength: Error in lfilen. Error = 2 (No such file or directory)
2006-08-05 09:52:49 Thread-124844976 ERROR util.files: nmeufile_getLength: Error in lfilen. Error = 2 (No such file or directory)
2006-08-06 09:52:49 Thread-26266544 ERROR util.files: nmeufile_getLength: Error in lfilen. Error = 2 (No such file or directory)
2006-08-07 09:52:48 Thread-34225072 ERROR util.files: nmeufile_getLength: Error in lfilen. Error = 2 (No such file or directory)
2006-08-07 11:30:11 Thread-76245936 ERROR vpxoci: Error on dequeue from SYS.ALERT_QUE: ORA-01089: immediate shutdown in progress - no operations are permitted
2006-08-07 11:30:12 Thread-76245936 ERROR vpxoci: Error on dequeue from SYS.ALERT_QUE: ORA-03114: not connected to ORACLE
2006-08-07 11:30:12 Thread-76245936 WARN vpxoci: OCI Error -- ErrorCode(12528): ORA-12528: TNS:listener: all appropriate instances are blocking new connections
SQL = " OCIServerAttach"...
LOGIN = dbsnmp/<PW>@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=BAANBACKUP)(PORT=1521))(CONNECT_DATA=(SID=baanbackup)))
2006-08-07 11:30:12 Thread-76245936 ERROR vpxoci: ORA-12528: TNS:listener: all appropriate instances are blocking new connections
2006-08-07 11:30:28 Thread-76245936 WARN vpxoci: OCI Error -- ErrorCode(12505): ORA-12505: TNS:listener does not currently know of SID given in connect descriptor
SQL = " OCIServerAttach"...
LOGIN = dbsnmp/<PW>@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=BAANBACKUP)(PORT=1521))(CONNECT_DATA=(SID=baanbackup)))
2006-08-07 11:30:28 Thread-76245936 ERROR vpxoci: ORA-12505: TNS:listener does not currently know of SID given in connect descriptor

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Agent Connection to Instance Unavailable

Win2k3 64 bit
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I brought up a new 10.2.0.5.0 db on Win2k3 64 bit server. Everything is working fine, at least it seems so. This server has been running for 2 months now and this issue kept coming up in the last 2 months.
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Agent Connection to Instance error in Oracle Database 11G EM

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I got a Database Instance and agent down.
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Thanks for you help. plz see copy message.
1)
Agent Connection to Instance
Status Failed
Details ORA-12505: TNS:listener does not currently know of SID given in connect descriptor (DBD ERROR: OCIServerAttach)
2)database instance
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Port 1521
SID sale
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Name LISTENER
Oracle Home D:\oracle\product\10.2.0\sale
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