I have X8DTU-F motherboards and setup with RADIUS authentication running the latest firmware release on website. Try to use IPMIView to login with RADIUS credentials it returns the error "RAKP Message 2 error: Unauthorized name (status code = 0Dh)"
Radius Authentication or LDAP is only supported by web interface. IPMIView is using ipmitool utility. Ipmitool utility did not support Radius Authentication.