JSF and load balancing issues

Hello,
We are having a difficult time getting our app to work correctly on our load balanced system. Any help / suggestions would be greatly appreciated.
We have a very basic load balancer which is in round robin mode (this cannot be changed), two separate vms, each with an instance of apache(2.0.54) and tomcat(6.0.14). Each apache talks only to the tomcat on the same vm and the tomcats are configured to session replicate with each other (which is happening).
When I log in to the app and start pressing a few buttons there are no problems for a little while. I then leave the screen idle for 1 minute and resume pressing buttons. The main session bean which holds information about where the user is and other key information, gets its constructor called and is set back to default and the page goes back to the main menu. Immediately before the bean is reset, the logs show the following:
[MyApp] 17 Jun 2009 15:33:27,514 WARN: [ajp-8009-2 LoggerListener.onApplicationEvent(60)] : Authentication event AuthenticationSuccessEvent: v; details: (etc etc removed…)This is what the two logs look like:
VM1 - Authentication event
VM2 - Main menu
VM2 - Presss a button – progress a screen
VM2 - Presss a button – progress a screen
VM2 - Presss a button – progress a screen
VM2 - Presss a button – progress a screen
[wait 1 min]
VM1 - Authentication event
VM1 - Bean reset
Processing continues, but screen is redirected to main menu
We have the distributable tag in the web.xml file and javax.faces.STATE_SAVING_METHOD is set to client. Its set to client as the app will not work at all with it set to server (keeps asking for the user to re-log in).
Thank you,
Victoria

Looks like a Tomcat issue to me. JSF is not going to timeout in 1 minute. You might want to check your Tomcat replication settings. Note try to do a very simple loadbalancing application that just echos the Tomcat is executing on.

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