JBoss Federated SSO does not currently have the tomcat patch to run on JBoss 4.2.
Currently it will work only on JBoss-4.0.4 and JBoss-4.0.5.
The task to support JBoss 4.2 can be tracked here: http://jira.jboss.com/jira/browse/JBSSO-36
Thanks for very quick answer. Is there any chance that you can predict the time of patch releasing?