Switchover in a data guard environment using Grid Control 10.2.0.3

I've tested switchover in a data guard environment using Data Guard Broker in Grid Control.
However, at times, i receive the message "RemoteOperationException: failed to establish input streaming thread". It looks like it has problems connecting to the remote node using the host credentials supplied. I know the credentials are ok because this worked before. If i test preferred credentials, it's ok too..
The workaround has been to restart the database and this seems to work.
Has anyone experienced this?

Thanks for All for replying.
*1. How can I upgrade my Grid control 10.2.0.3 to 10.2.0.4?*
I have upgraded the Grid Control Agent and OMS from 10.2.0.3 to 10.2.0.4
When we upgrade the OMS which also upgrade the Repository database.
Apply the patchset p3731593_10204_Linux-x86-64.zip (Which comes with Grid_Control_10.2.0.4.0_Linux-x86-64.zip)
su - oracle
cd 3731593/Disk1
./runInstaller (Run two times for Agent and oms upgrade)
Agent upgrade_
During upgrade
Specify Home Details: Select the Agent Home to upgrade Grid Control Agent.
Ex: /u01/app/oracle/OracleHomes/agent10g
OMS upgrade+
Specify Home Details: Select the oms home to upgrade oms
Ex: /u01/app/oracle/OracleHomes/oms10g
*2. How can I monitor/Connect my Existing database 10.2.0.4 from Grid Control 10.2.0.3?*
Install Grid Agent on the existing database server 10.2.0.4
Download Linux_x86_64_Grid_Control_agent_download_10_2_0_4_0.zip from OTN http://www.oracle.com/technology/software/products/oem/htdocs/agentsoft.html
su - oracle
cd /u01/software/GridAgent/linux_x64/agent
./runInstaller
Refer:
[To Install an Additional Management Agent Using OUI|http://download.oracle.com/docs/cd/B16240_01/doc/install.102/e10953/installing_em.htm#sthref318]
OracleÂ® Enterprise Manager Grid Control Installation and Basic Configuration
10g Release 4 (10.2.0.4)
Part Number E10953-05
3 Installing Enterprise Manager
Thanks
Mukarram Khan
Edited by: Mukarram Khan on Feb 6, 2009 11:04 PM

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