Assuming "RedHat AS 2" is RedHat Enterprise Linux Advance Server (Release 2).
If so, I believe this is designed for corporate use and that you need a support contract to download updates.
Alternatively, if you are using this for home use you might be better off with Fedora Core
(now on release 5) which replaced RedHat 9.
Or if you want to try an Enterprise edition of linux, try CentOS
which is based on Redhat Enterprise Linux.