In this session , we go over some basics of troubleshooting client connection issues on a cisco wireless controller.
For additional details on client debugs visit the following link
http://www.cisco.com/en/US/products/hw/wireless/ps430/products_tech_note09186a008091b08b.shtml
Starting Controller version 7.3 you can run client debugs for upto 10 clients at a time.
debug client <mac-addr-1> <mac-addr-2> <mac-addr-3>