Cisco AIR-AP1852 Failing to Join Controller

[Mohamed.Ashraf]

[*02/02/2020 16:27:41.4927] CAPWAP State: Discovery
[*02/02/2020 16:27:41.4927] IP DNS query for CISCO-CAPWAP-CONTROLLER.FarmFritesEgypt.com
[*02/02/2020 16:27:41.4927] DNS resolved CISCO-CAPWAP-CONTROLLER.FarmFritesEgypt.com
[*02/02/2020 16:27:41.4927] DNS discover IP addr: 10.11.100.100
[*02/02/2020 16:27:41.4927] Discovery Request sent to 10.11.100.100, discovery type DNS(3)
[*02/02/2020 16:27:41.4927] Discovery Request sent to 255.255.255.255, discovery type UNKNOWN(0)
[*02/02/2020 16:27:41.4927] Discovery Response from 10.11.100.100
[*02/02/2020 16:27:41.4927] Discovery response from MWAR ''running version 0.0.0.0 is rejected.
[*02/02/2020 16:27:41.4927] Failed to decode discovery response(status = 4).
[*02/02/2020 16:27:41.4927] CAPWAP SM handler: Failed to process message type 2 state 2.
[*02/02/2020 16:27:41.4927] Failed to handle capwap control message from controller - status 4
[*02/02/2020 16:27:41.4927] Failed to process unencrypted capwap packet 0x225a000 from 10.11.100.100
[*02/02/2020 16:27:41.4927] Failed to send message to CAPWAP state machine, msgId 0
[*02/02/2020 16:27:41.4927] Failed to send capwap message 0 to the state machine. Packet already freed.
[*02/02/2020 16:27:41.4927] IPv4 wtpProcessPacketFromSocket returned 4
[*02/02/2020 16:27:41.4927] Discovery Response from 10.11.100.100
[*02/02/2020 16:27:41.4927] Discovery response from MWAR ''running version 0.0.0.0 is rejected.
[*02/02/2020 16:27:41.4927] Failed to decode discovery response(status = 4).
[*02/02/2020 16:27:41.4927] CAPWAP SM handler: Failed to process message type 2 state 2.
[*02/02/2020 16:27:41.4927] Failed to handle capwap control message from controller - status 4
[*02/02/2020 16:27:41.4927] Failed to process unencrypted capwap packet 0x2260000 from 10.11.100.100
[*02/02/2020 16:27:41.4927] Failed to send message to CAPWAP state machine, msgId 0
[*02/02/2020 16:27:41.4927] Failed to send capwap message 0 to the state machine. Packet already freed.
[*02/02/2020 16:27:41.4927] IPv4 wtpProcessPacketFromSocket returned 4

Note :

Access points worked fine before for along time but this issue happened at 4 access points early 

Time with Access point is different with time at WLC 

[silvio.lui]

Sounds like no comunication between the AP and WLC, as no CAPWAP response after broadcast requirement .  If the WLC was not changed the firmware version (please ensure, because it would get incompatible SW), you could try it:

1- Ensure the WLC country is compatible with the AP domain

2 -Use the DHCP Option 43 to send the IP in Hex. to the AP

   to one WLC = f104.<AAAA:BBBB:CCCC:DDDD>

   for two WLC = f108.<AAAA:BBBB:CCCC:DDD>

[marce1000]

 - Check wireless/controller/software versions compatibility requirements :

                              Wireless compatibility matrix

  M.

[Mohamed.Ashraf]

Access points worked fine for along time berfore but this issue happened soon without any changes at WLC and access point.

[marce1000]

 - Make sure , time settings are correct and synchronized on all involved devices (controller + ap) - preferably use an NTP server (service). Also make sure that the Regulatory Domain settings on the controller are still valid and or aligned with the ap-models being used.

 M.

[Mohamed.Ashraf]

There are access points same model and Regular domain working now, This Issue happened for 5 access points