Check the security profile with 802.1X authentication.
Figure 237 CONFIGURATION > Object > AP profile > SSID > SSID List.
Check AP whether set the AP profile that you created.
Check the AD server whether receive the information from NXC5500 and
add the NXC5500 in the computers list automatically.
Figure 238 Windows2008 RADIUS server > Active Directory Users and
Computers > Computers