No more AP manager IP address remain

I have a few AP's that were working fine, had some power issues and they went offline. Now they will not reassociate with the controllers. I keep getting this error message.
*Mar 1 00:00:38.955: LWAPP_CLIENT_ERROR: lwapp_name_lookup - Could Not resolve CISCO-LWAPP-CONTROLL
ER
*Mar 1 00:00:48.959: %LWAPP-5-CHANGED: LWAPP changed state to JOIN
*Mar 1 00:00:48.959: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to administratively down
*Mar 1 00:00:48.960: %LINK-5-CHANGED: Interface Dot11Radio1, changed state to administratively down
*Mar 1 00:00:55.959: LWAPP_CLIENT_ERROR_DEBUG: spamHandleJoinTimer: Did not recieve the Join respon
se
*Mar 1 00:00:55.959: LWAPP_CLIENT_ERROR_DEBUG: No more AP manager IP addresses remain.
*Mar 1 00:01:00.963: LWAPP_CLIENT_ERROR_DEBUG: spamHandleJoinTimer: Did not recieve the Join respon
se
*Mar 1 00:01:00.963: LWAPP_CLIENT_ERROR_DEBUG: No more AP manager IP addresses remain.
*Mar 1 00:01:01.025: %SYS-5-RELOAD: Reload requested by LWAPP CLIENT. Reload Reason: DID NOT GET JO
IN RESPONSE.
*Mar 1 00:01:01.025: %LWAPP-5-CHANGED: LWAPP changed state to DOWN
Any suggestions or ideas would be appreciated.

A normal LWAPP discovery/join exchange between a WLC and AP looks like this:
1. AP sends LWAPP Discovery Request to WLC
2. WLC sends LWAPP Discovery Response to AP
3. AP sends LWAPP Join Request to WLC
4. WLC sends LWAPP Join Response to AP
If you follow the log messages, you can see the AP never got the LWAPP Join Response from the WLC. The log message "No more AP manager IP addresses remain" indicates the AP has exhausted it's candidate controller list and received no LWAPP Join Responses.
So, now you have to figure out why. You might take a swag and check the date/time on your controller is current. If it's defaulted, your AP certificates will be out of the valid date/time range and so the WLC won't validate them.
I'd start by running the following debug on your AP:
debug lwapp client event
That'll tell you that the AP is sending out the LWAPP Join Request to the right controller. If it's not, then you have to investigate what's going with the discovery phase.
Next, check that the LWAPP Join Request is arriving at your controller. At your controller console:
debug lwapp events enable
You should see a message that indicates the LWAPP Join Request has arrived from your AP. It'll also tell you if it sends an LWAPP Join Response.
The point is just walk through the LWAPP state machine and find the point where it's failing.
HTH...

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