[jboss-user] j_security_check 404 not found

if i redeploy my webapp and try to access a protected page, it will show the login screen but after clicking login it just reloads the login page instead of sending me to the protected page. if i reload the login page it will give me access to the page i wanted. if i fill in user/pass and hit login a 2nd time it shows: HTTP Status 404 - /j_security_check type Status report message /j_security_check description The requested resource (/j_security_check) is not available. Apache Tomcat/5.5.20