We have just discovered a problem with 802.1x authentication and Atheros cards.
We have seen this on both MAC OS X 10.6.0 systems and an XP System
This appears to be a DHCP problem in that clients don't get an IP address unless they reboot- which usually fixes it. Sometimes the controller will think the client is connected with a valid IP but the client doesn't actually get the address (never sends an ACK to the offer)
Then it will work until they try to reconnect again after a suspend or roaming to a new AP
Anybody seen this? It's making our network look bad since we have a lot of MACs with Atheros cards...