You take back to Cisco to see if they have a fix.
I am using Cisco Aironet 1562E outdoor AP (IP 172.25.70.189) and a virtual WLC (IP 172.25.70.163).
At the beginning, the AP was booting on version 220.127.116.11 (default OS) and the vWLC was running version 18.104.22.168.
I've had an issue when I tried to join the AP to the vWLC.
So I upgraded the AP to 22.214.171.124 and the vWLC to version 126.96.36.199 as I am trying to help it join the vWLC but I still have the same issue.
Here is the error message I am receiving in the AP CLI:
[*11/02/2017 02:38:13.4502] Discovery Response from 172.25.70.163
[*11/02/2017 02:38:13.4503] Discovery response from MWAR ''running version 0.0.0.0 is rejected.
[*11/02/2017 02:38:13.4503] Failed to decode discovery response.
[*11/02/2017 02:38:13.4503] CAPWAP SM handler: Failed to process message type 2 state 2.
[*11/02/2017 02:38:13.4503] Failed to handle capwap control message from controller - status 4
[*11/02/2017 02:38:13.4503] Failed to process unencrypted capwap packet 0x201a000 from 172.25.70.163
[*11/02/2017 02:38:13.4503] Failed to send capwap message 0 to the state machine. Packet already freed.
[*11/02/2017 02:38:13.4503] IPv4 wtpProcessPacketFromSocket returned 4
Can you please help us to resolve this issue ?