The Cisco NAC Appliance 4.1.6 has been retired and is no longer supported.
End-of-Sale Date: 2010-07-23
End-of-Support Date: 2013-07-31
Cisco's End-of-Life Policy
You can view a listing of available Network Visibility and Segmentation offerings that best meet your specific needs
If you want support information for the Cisco NAC Appliance 4.1.6 documentation, it may be available through Cisco.com Search or in the Cisco Community