Developing the authenticator I did see a similar error, in my situation the client machine had cached an old ticket for the host so when the ticked was decoded there was a checksum problem. In my situation logging out of the test client and back in caused the tickets to be correctly reloaded. I would suggest doing this and possibly the same on the machine hosting JBoss as well. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4168327#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...