Wireless client can't get an IP but can associate with the Cisco 1200 AP

Hi!
Good day to everyone.
I guess i need some help with regards to a problem of mine.
I have a Cisco 1200 AP with IOS 12.3(2), the client is MS Win XP on an IBM notebook with an onboard intel wireless client.
the RADIUS server is a MS IAS and it is integrated with MS Active directory where I authenticate.
somehow the client can associate with WPA and TKIP however it won't receive an IP add after logging into domain. I have tried clearing out the TKIP and WPA and leave authentication open and guest mode on the config. this would be successful.
I also want to ask what does the "list_name" on the methods of authentication on EAP? Is this a RADIUS server's name or the AD server's name?
Attach is the configuration I made on the AP.
Thanks in advance,
Chris

I have this same issue, it seems the AP is not supplying the group key needed to complete the authentiction...so your being authenticated, but not fully with the AP. I have a sniffer of a good connect and a bad one, its got something to do with the key (if you look at the link status, you will probably see something like this beside security
TKIP, WEP, Key Absent
The Key Absent portion is bad. Its whats stopping us from getting fully "connected" with our AP's, but i have yet to figure out why.

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Wireless client can't get an IP but can associate with the Cisco 1200 AP

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