SSO with user mapping

Hi all,

I have created a Http system and mapped the user ID and password for the login page of that System. Now when i created a URL Iview for a particular web application using the System defined above and after passing the username and password parameters as mapped user and mapped Password, i am not able to login into the web application. Its displaying the login page again asking for username and password. Can anyone plz tell me which settings are need to be done so that i should be able to login into the Web application directly after logging into the Portal. Thanks.

Regards,

Saby.