Modifying the Default Login Timeout Value for Grid Control 10g/11g

To prevent unauthorized access to the Grid Control console, Enterprise Manager will automatically log you out of the Grid Control console when there is no activity for a predefined period of time. For example, if you leave your browser open and leave your office, this default behavior prevents unauthorized users from using your Enterprise Manager administrator account.
By default, if the system is inactive for 45 minutes or more, and then you attempt to perform an Enterprise Manager action, you will be asked to log in to the Grid Control console again.

11g :

1. [oracle@EM_BOX config]$ $OMS_HOME/bin/emctl set property -name oracle.sysman.eml.maxInactiveTime -value -1 -sysman_pwd grid_pwd
Oracle Enterprise Manager 11g Release 1 Grid Control
Copyright (c) 1996, 2010 Oracle Corporation.  All rights reserved.
Property oracle.sysman.eml.maxInactiveTime for oms EM_BOX:4889_Management_Service has been set to value -1

#oracle.sysman.eml.maxInactiveTime=time_in_minutes
-1 : Unlimited Duration

2. Restart services to apply changed value

[oracle@EM_BOX config]$ $OMS_HOME/bin/emctl stop oms
[oracle@EM_BOX config]$ $OMS_HOME/bin/emctl start oms

10G :

1. Navigate to the <OMS_HOME>/sysman/config directory
2. Make a backup copy of the emoms.properties file. Go to the bottom of the file and add the line
#oracle.sysman.eml.maxInactiveTime=time_in_minutes
oracle.sysman.eml.maxInactiveTime=60

3. Restart services to apply changed value

[oracle@EM_BOX config]$ $OMS_HOME/bin/emctl stop oms
[oracle@EM_BOX config]$ $OMS_HOME/bin/emctl start oms