Intermediate SSL certificate

I am having an issue with intermediate SSL certificate and clients failing to validate the certificate. When using intermediate certs in for instance Apache there is a separate directive where you specify the intermediate certs. Then as part of the SSL handshake those certs are sent along to the client. I read that for FreeRadius just combine the cert with the intermediate cert into one file and then reference that in eap.conf:certificate_file. I have done that but clients are still failing certificate validation. Any help would be appreciated. Thanks