How to set a keep alive page for authenticated user?

Howto set a keep alive page for authenticated user?

Once the user is authenticated, there is auth-time out only on firewall. So the user will logout only when no traffice recevied.

But in so cases , the customer want to holdthe keepalive session  initiatively.  So below is the command to archive this goal.

#config systems global

#set auto-keepalive enable

#exit

diagnose firewall  auth clear

http://kb.fortinet.com/kb/documentLink.do?externalID=FD33675

Limit concurrent users at the same time, adminis out of control. The two load balance strategies will affect test.