On the icefaces side, use firefox + firebug. You can see what is being sent to the server, and the response (which can be stack traces which don't always show up in the standard logs) Attach a debugger to jboss and put breakpoints in your authentication method. If all else fails you can always download the source for seam and put breakpoints in the seam src. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4060910#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...