Hi
Unknown NAS basically means that the ACS has received an authentication request from a device that has not been configured on the ACS.
For example, you would normally add your switches, dial-in boxes, etc to ACS, putting in the shared secret key etc.
If the device that sends an auth request isn't added, the ACS will not respond to the device, and it will log the event.
If it's a device that should use ACS services, then you need to add it to the ACS network configuratin.
Regards
Aaron
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Aaron
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