"genman" wrote : Not really a beginner's question, I would think. Maybe the a4j:poll doesn't extend the life of the session? For instance, do you see any issue when the session cannot expire? You can try the ajax4jsf forums. Hi Genman, Thanks for your reply. I know it is not a beginner's question, but, i didn't find a better topic related with the issue of "SSO and ajax4jsf" that we are experiencing. I will try in the forum of ajax4jsf as you told me. Nevertheless, i would like to tell you that a4j:poll does extend the life of the session, till, "something" happens that expires all the sessions related with SSO, we couldn't find the real cause, and as i told in my post earlier, this doesn't happens in the test environment with practically no load. In the production environment we have 2 nodes running and one of them receives more load than the other. In jira i saw issues talking about problems with FC protocol used by jgroups, the protocol used by JBossCache to synchronize the state of the whole cluster, that could malfunction with sustained overload. Thanks anyway. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4239141#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...