"mputz" wrote : You don't need the cookieDomain, as long as you don't have different host names. Have you seen this wiki on SSO? | http://wiki.jboss.org/wiki/Wiki.jsp?page=SingleSignOn Yes, I've seen that wiki. And I've followed that wiki to establish my cluster, except that I used two PCs instead of one. I've configed the org.jboss.web.tomcat.tc5.sso.ClusteredSingleSignOn, enabled the IE cookie. Everything is ok on startup, but when I login on 10.1.16.64, and then visit http://10.1.16.140/portal, it shows that I'm not login. So I try the cookieDomain attribute, but it also don't work. Is there anything wrong? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4053873#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...