I am not sure if this information is relevant to your problem. But there is a special mention at Cisco website regarding configuration of Cisco AP with non-Cisco wireless client when using LEAP. U may refer to url below:
If this is irrelevant, just ignore this message
Thank you for the replies. I'm looking forward to finding this. My company is a very large Cisco partner so there are a lot things riding on finding this answer. Anyway, I too cannot find the article using the code or the search term you have referenced. Please keep me posted with a URL if possible.
Sorry about that. I thought the article would be published overnight. It should go live by 9/3. The url will be http://support.intel.com/support/wireless/wlan/sb/CS-030849.htm.
Intel Customer Support
I followed all the steps until i reached to the step number (16) in the link below:
I did not found "Cisco: Leap" in the list of "Network Authentication Method"
I have Intel(R) WiFi Link 5300 AGN.
Thanks in advance
Around October 19-22nd, Intel updated their latest drivers for Windows 7 surrounding the Win7 launch. This allowed me to get the right drivers for my Windows 7 box, which I needed for a Dell Latitude E4300 laptop with Intel 5300 AGN wifi controller. This gave me the "Cisco: LEAP" authentication option as a drop-down, but I still had a connection problem just like the original poster commented.
The GOOD NEWS! As soon as we updated our Cisco Secure ACS (RADIUS) server from 3.x to 4.x and VOILA!! problem was solved. I hope this is helpful to you as well, if not best of luck, but I was amazed and very happy when this upgrade resolved our connectivity issues with Cisco LEAP, Intel 5300 AGN and Windows 7.