Access reject problem

Hi I have configured RADIUS server in windows server 2008 R2 as mentioned in below link. http://docs.openvpn.net/how-to-tutorialsguides/administration/configuring-ac... After that running radexample.c as it is available in free-radius client framework, but getting access reject error. I verified that what user I am using to authenticate is available in groups which is configured there. I am not getting any idea that why I am getting access reject (PW_ACCESS_REJECT) error. any help in this issue will be very helpful to me. Thanks Arvind Kumar Gupta