After seeing some TKIP-MIC errors for a few wireless clients and reading the benefits of AES over TKIP I switched our encryption to WPA-AES.
The majority of our clients have migrated well, however I am seeing a lot of decrypt errors on the wireless controllers.
"Decrypt errors occurred for client 00:21:63:ba:af:9f using WPA key on 802.11b/g interface of AP 00:1f:ca:82:c9:70"
It's not a particular machine, but rather a large number of them. They appear to be associating and authenticating but the trap log is filling quickly with a large number of these errors.
I'd prefer to stay with AES, but TKIP gave me a lot less errors. :)
Cisco 4404 WLC's
Cisco 1131AG LWAPP's
RADIUS Authentication via Microsoft IAS