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I am using ACS 4.1 for MAC based authentication as to whether or not to allow a device on the network. It is working fine for most devies but for some of the Windows XP computers I have to disable IEEE authentication on the NIC and create a registry key "SupplicantMode" with a value of "0". Does anyone know a way around having to do this on XP computers? If I don't does this I get a message saying "Windows was unable to find a certificate to log you on to the network" and the XP machines do not get authenticated.
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