Change vCenter Web UI Timeout

By default, the vCenter web UI (Flash/Flex or HTML5) will kick users out after a certain period of inactivity.  Usually, at least in my experience, users get kicked multiple times per day.  Here's how to extend that timeout.

Instructions

1. SSH into your vCenter appliance
2. Edit /etc/vmware/vsphere-ui/webclient.properties
   Change the following line from 

   session.timeout = 120

   to

   session.timeout = 600

   1. Note: This value is in seconds. For example, a value of 600 equals 10 hours.
3. Restart the HTML5 web UI: 

   service-control --stop vsphere-ui
   service-control --start vsphere-ui

4. Restart the Flash (Flex) web UI: 

   service-control --stop vsphere-control
   service-control --start vsphere-control

5. Done!