Cisco Wireless :: 1142 - 802.1x Authentication On Macbooks Running Lion

802.1x authentication on their Cisco Wifi network using Macbook Pro/Airs running Lion.
 
We have.. 2x Controllers with WiSMs running 7.0.116.0 A mixture of 1131 and 1142 APs..  ( APs mainly in HREAP mode with some APs located on the same local network as the Controller in Local Mode ) Macbook Airs/ Pro running Lion
 
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In summary, we are finding that when our MacBooks are coming out of sleep/standby or roaming between APs, the devices get stuck during the 802.1x authentication process and will either get the self assigned 169 address or continuously try to authenticate.
 
This can occasionally be solved by turning the wifi interface off and on or manually stopping and starting the 802.1x process on the Mac
 
From reading various online forums, we have tried the following to resolve this..
 
- Disabled WPA across our wifi network as we don't use it anymore.. We now just use WPA2 with AES and Dot1x authentication.
 
- Disabled Client Load Balancing on the SSID configuration… this does not seem to have made things any better or worse although we are seeing more Load Profile threshold notification alerts for some of our APs which are used heavily.
 
- The 802.1x time out is currently set at 20secs.
 
- Some APs which are in Local mode ( due to them being on the same local network as our wifi controllers ) have been changed to HREAP mode and assigned a static IP address.. We found that this was required at our spoke sites where we were originally experiencing issues with our old Windows based devices.. Incidentally, we have not experienced any of these delayed authentication issues with our Window laptops, all our problems seem to be with our MacBooks running Lion..
  
As I mentioned earlier, there seems to be many discussions online regarding problems with the Lion OS and 802.1x authentication..