wlc 2504 APs not joining time is correct

[Elesh]

My APs are not joining the controller all of a sudden. The APs used to work fine but after a reboot ALL of them are not joining. 

I set the date and time manually and set a NTP server and rebooted, but still have the same issue. I can ping the APs.

Under Statistics -> ap join, I select the AP. Under discovery phase stats, it shows last successful attempt with a recent time, and last unsuccessful attemp is blank. There are no errors, all blank

One funny thing I notice when i run  Show Sysinfo is this line:

OUI File Last Update Time........................ Sun Sep 07 10:44:07 IST 2014

Does anyone have any ideas?

[Rich R]

Resetting time to the past (temporarily) is simply to allow the APs to join as if the certs had not expired yet - so they can download new software and config from the WLC.
The config is done as global config on the WLC only.  The WLC will update every AP which joins with that config - but only after they have been updated to the new software which supports that config.