Openvpn server and Freeradius client

running: Redhat Enterprise Linux version 4 Openvpn 2.0.7 (server) freeradius pam_radius-1.3.16 (client) Using the above the Openvpn server will authenticate an Openvpn client using a radius server on a remote machine. The above ONLY works when the username supplied by the Openvpn client is found in the passwd file on the Openvpn server. Yes it does use the radius server to authenticate. As you can imagine this is not the behavior I want. I have no clue where the problem(s) is/are?! Is it redhat, Openvpn, Freeradius or a combination of the three? Does anyone have a clue, hint, or idea what the problem might be? Can anyone point me in the right direction? hal