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I'm not sure if most of you are aware, the guys have been working hard on putting a lot of the helpful TAC knowledge base articles on airheads. There are not only troubleshooting Kbs but also a few How-Tos.
Full KB
http://community.arubanetworks.com/t5/tkb/communitypage
AAA/NAC KB
http://community.arubanetworks.com/t5/AAA-NAC-Guest-Access-BYOD/tkb-p/AAANACGuestAccessBYOD
Example helpful KB:
Cisco Switch
http://community.arubanetworks.com/t5/AAA-NAC-Guest-Access-BYOD/How-to-Enable-Dot1x-authentication-for-wired-clients-in-Cisco/ta-p/187704
Common Clearpass domain Joining errors
http://community.arubanetworks.com/t5/AAA-NAC-Guest-Access-BYOD/Common-Clearpass-domain-Joining-errors/ta-p/192591