3.2.5.1.7 MS-Machine-Name
If a RADIUS server receives this attribute, it SHOULD determine the machine groups to which the machine specified in the attribute belongs, and it MUST search the PolicyConfiguration.MachineName ADM element specified in section 3.2.1 for the value of the VSA. If a match was not found, the server SHOULD send an Access-Reject message back to the NAS and stop processing.
For more details about this attribute, see section 2.2.1.14.