Well first off, are you doing PEAP or EAP-TLS? Did you install a certificate ins ACS 5.3? How did you configure your SSID? How did you configure your plicy in ACS? What does the log show in ACS when the device tries to authenticate. Here is a support doc, but has the ACS using the local database for user authentication. You should try this first and then we can work on the AD side.
Follow the link that Scott provided. ignore the certificate part and see how AD groups are mapped and used in the policies. That word file is very useful for you. Follow it and if you find it useful rate the doc.
You want to say "Thank you"? Don't. Just rate the useful answers, that is more useful than "Thank you".
Rating useful replies is more useful than saying "Thank you"
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
and OmniPeek. The 1st installment is a table of advanced filters. More
filters will be added as time allows. It is a living doc, so check back
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