How to implement SSO with moodle and wordpress blog?

I have moodle installation and wordpress blog. When user logged on to moodle want to access wordpress blog. i want to implement sso with moodle(1.9.7) and wordpress(3.0.1) blog. I am using [External DB authentication][1] plugin. I want to access my wordpress blog through my Moodle database. I did all given steps at [Authenticate Users From Moodle Into WordPress MU][2]. Right now, admin is able to sign in both moodle and wordpress using my moodle database, But other users in facing "wrong user name or password error". Kindly advice Thanks in advance. [1]: http://wordpress.org/extend/plugins/external-database-authentication/ [2]: http://jasontbedell.com/how-to-authenticate-users-from-moodle-into-wordpress-mu