I just tried installing JBoss Portal + JBoss AS 2.2.1-SP2 Production 57.8 MB 2006-06-24 on my home computer and got exactly the same problem as before - Internet Explorer throwing HTTP 400 error. Here are the steps i went thru: downloaded a bundle. Unzipped it. Renamed the folder to "jboss-4.0.4", then went to bin directory and ran "run.bat". Then went to http://localhost:8080/portal, clicked standard login and then put "admin/admin" No errors trying to start jboss or after i clicked "login". This is the URL i am seeing after i click "login" http://localhost:8080/portal/auth/j_security_check%> and HTTP 400 error. This is the URL i get on Mozillla. http://localhost:8080/portal/auth/j_security_check%%3E and no error displayed on the page, just blank page. I think there must be something to it since i didn't set up anything special, just downloaded and ran. Please let me know if you have any suggestions. Thank you![/img] View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3958244#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...