C9120AXI-E not joining 5520 WLC

[cupkeyk]

Hello Experts! 

We are encountering issue with C9120AXI-E not joining 5520 WLC. 

Manufactured: 2021

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AP image version 8.10.196.0 backup 8.10.130.0, Controller 8.10.196.0
Version is the same, do not need update.

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CAPWAP State: Configure
capwapd: reading file /click/nss_lag_control/lacp_state: No such file or directory
reading /click/nss_lag_control/lacp_state failed [2]: No such file or directory
reading /click/nss_lag_control/capwap_state failed [2]: No such file or directory
Check lagloadbalance setting flex mode 0 cfg 0 linkstate 1 ap_type 86
!!!!! {/opt/cisco/bin/capwapd} reading /click/nss_lag_control/lacp_state failed [2]: No such file or directory
capwapd: reading file /click/nss_lag_control/capwap_state: No such file or directory

!!!!! {/opt/cisco/bin/capwapd} reading /click/nss_lag_control/capwap_state failed [2]: No such file or directory
Re-Tx Count=1, Max Re-Tx Value=5, SendSeqNum=1, NumofPendingMsgs=1

Re-Tx Count=2, Max Re-Tx Value=5, SendSeqNum=1, NumofPendingMsgs=1

Re-Tx Count=3, Max Re-Tx Value=5, SendSeqNum=1, NumofPendingMsgs=1

Discarding msg CAPWAP_WTP_EVENT_REQUEST(type 9) in CAPWAP state: Configure(8).
Discarding msg CAPWAP_WTP_EVENT_REQUEST(type 9) in CAPWAP state: Configure(8).
Re-Tx Count=4, Max Re-Tx Value=5, SendSeqNum=1, NumofPendingMsgs=1

Re-Tx Count=5, Max Re-Tx Value=5, SendSeqNum=1, NumofPendingMsgs=1

Max retransmission count exceeded, going back to DISCOVER mode.
Dropping msg CAPWAP_CONFIGURATION_STATUS, type = 4, len = 2751, eleLen = 2759, sendSeqNum = 1
GOING BACK TO DISCOVER MODE
CAPWAP State: DTLS Teardown
[ABORT]
upgrade.sh: Script called with args:[ABORT]
do ABORT, part2 is active part
upgrade: Cleanup tmp files ...
upgrade.sh: Cleanup tmp files ...
Discarding msg CAPWAP_WTP_EVENT_REQUEST(type 9) in CAPWAP state: DTLS Teardown(4).
Discarding msg CAPWAP_WTP_EVENT_REQUEST(type 9) in CAPWAP state: DTLS Teardown(4).

Thank you in advance!

[marce1000]

  - To me it looks like the current image on the AP is corrupt. Install manually e.g.

 M.

[Saikat Nandy]

Could you try increasing the CAPWAP timers from 5 & 3 to 8 & 5. Also share the entire output of the AP please, along with 'show version'.

[Rich R]

@cupkeyk  Is it only 1 AP affected?
Are other APs able to join ok?
Did you try factory default reset on the AP?
What logs do you see on the WLC?
What do the join stats for that AP show on the WLC?
What is the uptime of the WLC?
If the WLC is an HA-SSO pair have you tried doing a switchover to backup and then back to primary after it has reloaded? (= WLC reload with minimum disruption)
As Marce says you can try manual reinstall of the software but I don't think that is the problem here:
https://software.cisco.com/download/home/286322988/type/286288051/release/15.3.3-JK11