Are you running the Portal+AS bundle, or did you download AS and the Portal separately? If the latter, read the AS readme.html file, first item under JBoss AS 4.2.0 under Configuration issues.
Or see this: https://www.jboss.org/community/docs/DOC-10179
By the way, Jaikiran provided the above link, which contains the solution to your problem, when he asked you to start a new topic. Any reason why you didn't look at that link?
Did you even look at the link I provided???