All APs lost connectivity with 2504 and cannot reconnect

[jbournenull]

I had 5 APs on a 2504 Wireless Controller - they all lost connectivity and I cannot join them to the AP now.

At a loss for why this happened and how to fix it.  Any help would be greatly appreciated.  thanks

[Sandeep Choudhary]

Please check the time on WLC and make sure its correct.

Also configure NTP server IP, from where WLC can update its time.

Regards

Dont forget to arte helpful posts

[Leo Laohoo]

Post the complete output to the following commands: 

1. WLC:  sh sysinfo
2. WLC:  sh time
3. AP:  sh version
4. AP:  sh ip interface brief

[marce1000]

 - Check the logs on the controller when the AP's try to reconnect, also boot  an AP and attach a console, post the output from the boot-process here.

 M.

[Rich R]

You don't mention what model of AP or version of software you're working with?

Have you carefully read the field notice https://www.cisco.com/c/en/us/support/docs/field-notices/639/fn63942.html and followed ALL the steps in the right order?