I have a WLC and I have a SSID with Radius Authentication, it was working but after a while it stops working:
I did a tracebuf:
(PA-TB-WCONTROLLER01) #show auth-tracebuf mac 94:65:9c:45...
(PA-TB-WCONTROLLER01) #show auth-tracebuf mac 94:65:9c:45:7a:31
Auth Trace Buffer
-----------------
May 25 07:13:23 station-up * 94:65:9c:45:7a:31 40:e3:d6:51:77:90 - - wpa2 aes
May 25 07:13:23 eap-id-req <- 94:65:9c:45:7a:31 40:e3:d6:51:77:90 1 5
May 25 07:13:26 station-down * 94:65:9c:45:7a:31 40:e3:d6:51:77:90 - -
May 25 07:18:16 station-up * 94:65:9c:45:7a:31 40:e3:d6:51:77:90 - - wpa2 aes
May 25 07:18:16 eap-id-req <- 94:65:9c:45:7a:31 40:e3:d6:51:77:90 1 5
May 25 07:18:19 station-down * 94:65:9c:45:7a:31 40:e3:d6:51:77:90 - -
May 25 07:18:36 station-up * 94:65:9c:45:7a:31 40:e3:d6:51:77:90 - - wpa2 aes
May 25 07:18:36 eap-id-req <- 94:65:9c:45:7a:31 40:e3:d6:51:77:90 1 5
May 25 07:18:39 station-down * 94:65:9c:45:7a:31 40:e3:d6:51:77:90 - -