AP541N - WPA Enterprise - Failed to connect

Hi,
I am trying to configure an AP541N with WPA Enterprise. My RADIUS server is an MS ISA 2003 and is already working fine with other devices (I have a ASA5510 also configured to use RADIUS authentication with this server). When I try to connect, I am getting the following error message on the event log of the AP541N:
Aug 4 18:37:36
info
hostapd
wlan0: IEEE 802.11 STA 00:19:d2:9e:7a:81 deauthed from BSSID 00:21:29:01:60:e0 reason 1
Aug 4 18:37:36
info
hostapd
wlan0: STA 00:19:d2:9e:7a:81 IEEE 802.1X: Supplicant used different EAP type: 1 (Identity)
Aug 4 18:37:36
warn
hostapd
wlan0: STA 00:19:d2:9e:7a:81 IEEE 802.1X: authentication failed - identity 'MYDOMAIN\myuser' EAP type: 0 (Unknown)
Aug 4 18:37:36
info
hostapd
The wireless client with MAC address 00:19:d2:9e:7a:81 had an authentication failure.
Aug 4 18:37:36
warn
hostapd
wlan0: STA 00:19:d2:9e:7a:81 IEEE 802.1X: could not extract EAP-Message from RADIUS message
However, I do not see any error message on the ISA side. It actually tells me that the authentication happens fine. Any suggestion how I could troubleshoot this problem?
Thank you in advance for your help and have a great day,
Alex

After investigation, I found that my ISA server was not configured properly. Here is the URL I used to configure it properly: http://technet.microsoft.com/en-us/library/cc779009(WS.10).aspx

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AP541N - WPA Enterprise - Failed to connect

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