I am trying to in an install an SSL certificate issued by Janet on a freeradius (open source radius application). The installation and the configuration went fine however Microsoft windows vista and Apple Mac machines are prompting that the certificate is not chain. Here my TLS configuration in /etc/raddb/eap.conf private_key_password = uc123uc private_key_file = ${certdir}/jaguar.key certificate_file = ${certdir}/cert.pem CA_file = ${cadir}/sureserverEDU.pem The CA_file is pointing at the intermediate root certificate however windows vista and Apple Mac client are informing me that the certificate is not chained. I even tried concatenating all certificate in one file like: but no joy cat sureserverEDU.pem > mycert.pem cat cert.pem >> mycert.pem I also tried concatenating all certificate in one file like cat ct_root.der > mycert.pem cat sureserverEDU.pem >> mycert.pem cat cert.pem >> mycert.pem But this is not working either, Can you shad some light on this please? Thank again. Note ct_root.der is the GTE CyberTrust Global Root sureserverEDU.pem is the Cybertrust Educational CA cert.pem is my globalsign certificate