cloud control : page expired click ok turn off

problem:
You will get Page expired click ok message if you are not active for a while. it is annoying if you just need refresh a window.

solution:
turn expried page off

1. Set the value for the OMS ORACLE_HOME environment variable and go to ‘OMS/bin’. For example:
   export ORACLE_HOME=/u01/app/oracle/product/Middleware/oms
   cd $ORACLE_HOME/bin
2. increase timeout or disable this feature with ‘-1′ value:
3. ./emctl set property -name oracle.sysman.eml.maxInactiveTime -value -1 -sysman_pwd sysman_password
4. Restart OMS to reflect the new settings:
   ./emctl stop oms
   ./emctl start oms

referecne:
http://odenysenko.wordpress.com/2012/04/09/oem-12c-the-page-has-expired-click-ok-to-continue/