I'm attempting to use FreeRADIUS to do EAP-TLS with Windows XP using machine authentication. I set up FreeRADIUS following the guide at http://wiki.freeradius.org/WPA_HOWTO#Step_2:_Configure_FreeRADIUS and I'm using OpenSSL to generate the cetificates. I can authenticate using user certificates fine, so I'm pretty sure all the Certificates & CA setup is right on the RADIUS server certificate, User certificate, and the Root Certificate. That leaves the Computer Certificate. I generated the computer certificate to have the common name be the machine name (I've tried it plain and FQDN) and I've put the FQDN is the altSubjectName field as well. It has the same usage extensions as the User certificates. (TLS Client Auth: 1.3.6.1.5.5.7.3.2) I set the AuthMode registry key to Computer Only (2), and it trys to authenticate which suggests that the workstation is okay with the certificate. Computer Certificate details: http://www.cs.odu.edu/~olson/eap/computer.crt.txt Other than that I can't think of where to look for a problem. Comparing logs between user and computer authentication I can see where it starts differing but I can't find anything I can interpret as to why. Nothing seems to fail for the computer, it just cycles endlessly. Successful User Authentication Log: http://www.cs.odu.edu/~olson/eap/eap-tls_user_auth.log Failed Computer Authentication Log: http://www.cs.odu.edu/~olson/eap/eap-tls_computer_auth.log I also tossed out the windows tracing logs for both user and computer auth and anything else that seemed useful in http://www.cs.odu.edu/~olson/eap/ Can anybody give me a pointer on where to look for problems? Thanks -- Mike Olson