FOUND CONFIGURED WLC (Primary) REDISCOVER TO CONNECT WITH THAT.

[JustTakeTheFirstStep]

9120 AP continuously repeats Join & Disjoin from 9800 WLC

I don't know why rediscovery.
someone give me a hint

I have done Layer1 check.
9800 WLC replacement
cable replacement
switch replacement
AP replacement

Please check the attached txt file

[*08/29/2023 19:16:56.4270] FOUND CONFIGURED WLC (Primary) REDISCOVER TO CONNECT WITH THAT.
[*08/29/2023 19:16:56.4440] OOBImageDnld: OOBImageDownloadTimer expired for image download..
[*08/29/2023 19:16:56.4440] OOBImageDnld: Do common error handler for OOB image download..
[*08/29/2023 19:16:56.4730]
[*08/29/2023 19:16:56.4730] CAPWAP State: DTLS Teardown
[*08/29/2023 19:16:56.4740] DOT11_DRV[0]: Stop Radio0
[*08/29/2023 19:16:56.4740] Stopped Radio 0
[*08/29/2023 19:16:56.4950] DOT11_DRV[1]: Stop Radio1
[*08/29/2023 19:16:56.4950] Stopped Radio 1
[*08/29/2023 19:16:56.5560] OOBImageDnld: Do common error handler for OOB image download..
[*08/29/2023 19:16:56.6380] status 'upgrade.sh: Script called with args:[CANCEL]'
[*08/29/2023 19:16:56.6800] do CANCEL, part1 is active part
[*08/29/2023 19:16:56.6990] status 'upgrade.sh: Cleanup tmp files ...'
[*08/29/2023 19:16:56.7240] Dropping dtls packet since session is not established. Peer 10.0.15.200-5246, Local 10.0.15.202-5254, conn (nil)
[*08/29/2023 19:16:56.7240] Discarding msg CAPWAP_WTP_EVENT_REQUEST(type 9) in CAPWAP state: DTLS Teardown(4).
[*08/29/2023 19:16:56.7240] Discarding msg CAPWAP_WTP_EVENT_REQUEST(type 9) in CAPWAP state: DTLS Teardown(4).
[*08/29/2023 19:16:59.3770] Discarding msg CAPWAP_WTP_EVENT_REQUEST(type 9) in CAPWAP state: DTLS Teardown(4).
[*08/29/2023 19:17:01.1730] OOBImageDnld: OOBImageDownloadTimer expired for image download..
[*08/29/2023 19:17:01.1730] OOBImageDnld: Do common error handler for OOB image download..
[*08/29/2023 19:17:01.1910] dtls_queue_first: Nothing to extract!
[*08/29/2023 19:17:01.1910]
[*08/29/2023 19:17:11.2010]
[*08/29/2023 19:17:11.2010] CAPWAP State: Discovery
[*08/29/2023 19:17:11.2030] Discovery Request sent to 10.0.15.200, discovery type STATIC_CONFIG(1)
[*08/29/2023 19:17:11.2050] Discovery Request sent to 255.255.255.255, discovery type UNKNOWN(0)
[*08/29/2023 19:17:11.2050] Discovery Response from 10.0.15.200
[*08/29/2023 19:17:11.2060] Discovery Response from 10.0.15.200
[*08/29/2023 19:17:20.0000] Started wait dtls timer (60 sec)
[*08/29/2023 19:17:20.0060]
[*08/29/2023 19:17:20.0060] CAPWAP State: DTLS Setup
[*08/29/2023 19:17:20.0640] dtls_verify_server_cert: Controller certificate verification successful
[*08/29/2023 19:17:20.4260]
[*08/29/2023 19:17:20.4260] CAPWAP State: Join
[*08/29/2023 19:17:20.4480] OOBImageDnld: OOB Image Download in ap_cap_bitmask(2)
[*08/29/2023 19:17:20.4480] Sending Join request to 10.0.15.200 through port 5254, packet size 1376
[*08/29/2023 19:17:25.1420] OOBImageDnld: OOB Image Download in ap_cap_bitmask(2)
[*08/29/2023 19:17:25.1420] Sending Join request to 10.0.15.200 through port 5254, packet size 1376
[*08/29/2023 19:17:25.1460] Join Response from 10.0.15.200, packet size 1397
[*08/29/2023 19:17:25.1460] AC accepted previous sent request with result code: 0
[*08/29/2023 19:17:25.1460] Received wlcType 0, timer 30
[*08/29/2023 19:17:25.1720]
[*08/29/2023 19:17:25.1720] CAPWAP State: Image Data
[*08/29/2023 19:17:25.1910] AP image version 17.9.3.50 backup 17.6.5.22, Controller 17.9.3.50
[*08/29/2023 19:17:25.1910] Version is the same, do not need update.
[*08/29/2023 19:17:25.2310] status 'upgrade.sh: Script called with args:[NO_UPGRADE]'
[*08/29/2023 19:17:25.2730] do NO_UPGRADE, part1 is active part
[*08/29/2023 19:17:25.2850]
[*08/29/2023 19:17:25.2850] CAPWAP State: Configure
[*08/29/2023 19:17:25.4710] DOT11_CFG[1]: Starting radio 1
[*08/29/2023 19:17:25.4720] DOT11_DRV[1]: Start Radio1
[*08/29/2023 19:17:25.4790] DOT11_DRV[1]: set_channel Channel set to 36/40
[*08/29/2023 19:17:25.9200] Started Radio 1
[*08/29/2023 19:17:25.9200] DOT11_CFG[0]: Starting radio 0
[*08/29/2023 19:17:25.9210] DOT11_DRV[0]: Start Radio0
[*08/29/2023 19:17:25.9280] DOT11_DRV[0]: set_channel Channel set to 1/20
[*08/29/2023 19:17:26.3760] Started Radio 0
[*08/29/2023 19:17:26.6440]
[*08/29/2023 19:17:26.6450] CAPWAP State: Run
[*08/29/2023 19:17:26.7100] AP has joined controller
[*08/29/2023 19:17:26.9980] Previous AP mode is 0, change to 0

[Leo Laohoo]

Factory reset the AP.

[balaji.bandi]

I would like to ask first - Do you have enough License for AP ?

check the NTP and Zone for the Compliance

as per the Last Log it says its joined - its bizzard - i do not believe that is bug -since 17.9.3 is good version ?

AP has joined controller

AP tag change to default-policy-tag

[Rich R]

How often is it disjoining/joining?
Is it always the same fixed time?
What reason does the WLC give for the disjoin?
Have you run a radioactive trace on the AP IP and MAC address to capture debugs when the AP disjoins?

[JustTakeTheFirstStep]

@Rich R 

attached Radioactive Trace

[Rich R]

> Model: C9800-L-F-K9 - did you update the PHY firmware?
https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/config-guide/b_upgrade_fpga_c9800.html
https://software.cisco.com/download/home/286321399/type/283425232/release/17.11.1

> Failed to send capwapcountry code update to AP
Have you configured the country? Is the AP regulatory domain compatible with the country?

Do you have DTLS data encryption enabled?  If you do turn it off.

It looks like the AP is closing the connection so you might need to enable CAPWAP debugs on the AP.

[JustTakeTheFirstStep]

@Leo Laohoo 

I performed a factory reset.
Also, I have replaced the AP with a new AP several times.

@balaji.bandi 

AP is already using the default tag.
WLC's clock is normal.

WLC#ping tools.cisco.com
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 173.37.145.8, timeout is 2 seconds:
!!!!!

WLC#sh license summary
Account Information:
Smart Account: <none>
Virtual Account: <none>

License Usage:
License Entitlement Tag Count Status
-----------------------------------------------------------------------------
No licenses in use

WLC#show license authorization
Overall status:
Active: PID:C9800-L-F-K9,
Status: NOT INSTALLED

Purchased Licenses:
No Purchase Information Available

Q. What happens if I do not license my 9800 WLC?

A.Even if the controller is not properly licensed, it is fully functional. 

@Rich R 

WLC#
Sep 1 19:34:46.931: %CAPWAPAC_SMGR_TRACE_MESSAGE-5-AP_JOIN_DISJOIN: Chassis 1 R0/0: wncd: AP Event: AP Name: APA4B4.392C.F364 Mac: 2c57.4192.8920 Session-IP: 10.0.15.202[5264] 10.0.15.200[5246] Ethernet MAC: a4b4.392c.f364 Joined
WLC#
Sep 1 19:36:39.529: %CAPWAPAC_SMGR_TRACE_MESSAGE-5-AP_JOIN_DISJOIN: Chassis 1 R0/0: wncd: AP Event: AP Name: APA4B4.392C.F364 Mac: 2c57.4192.8920 Session-IP: 10.0.15.202[5264] 10.0.15.200[5246] Disjoined DTLS close alert from peer
WLC#
Sep 1 19:37:10.178: %APMGR_TRACE_MESSAGE-4-WLC_APMGR_WARNING_MSG: Chassis 1 R0/0: wncd: Warning, AP APA4B4.392C.F364 is associated with the policy tag default-policy-tag, which has no wlan or rlan configured. Please configure wlan or rlan under the policy tag or associate the AP with valid policy tag
WLC#
Sep 1 19:37:10.232: %CAPWAPAC_SMGR_TRACE_MESSAGE-5-AP_JOIN_DISJOIN: Chassis 1 R0/0: wncd: AP Event: AP Name: APA4B4.392C.F364 Mac: 2c57.4192.8920 Session-IP: 10.0.15.202[5264] 10.0.15.200[5246] Ethernet MAC: a4b4.392c.f364 Joined
WLC#
Sep 1 19:39:02.819: %CAPWAPAC_SMGR_TRACE_MESSAGE-5-AP_JOIN_DISJOIN: Chassis 1 R0/0: wncd: AP Event: AP Name: APA4B4.392C.F364 Mac: 2c57.4192.8920 Session-IP: 10.0.15.202[5264] 10.0.15.200[5246] Disjoined DTLS close alert from peer
WLC#
Sep 1 19:39:33.508: %APMGR_TRACE_MESSAGE-4-WLC_APMGR_WARNING_MSG: Chassis 1 R0/0: wncd: Warning, AP APA4B4.392C.F364 is associated with the policy tag default-policy-tag, which has no wlan or rlan configured. Please configure wlan or rlan under the policy tag or associate the AP with valid policy tag
WLC#
Sep 1 19:39:33.571: %CAPWAPAC_SMGR_TRACE_MESSAGE-5-AP_JOIN_DISJOIN: Chassis 1 R0/0: wncd: AP Event: AP Name: APA4B4.392C.F364 Mac: 2c57.4192.8920 Session-IP: 10.0.15.202[5264] 10.0.15.200[5246] Ethernet MAC: a4b4.392c.f364 Joined
WLC#
Sep 1 19:41:26.145: %CAPWAPAC_SMGR_TRACE_MESSAGE-5-AP_JOIN_DISJOIN: Chassis 1 R0/0: wncd: AP Event: AP Name: APA4B4.392C.F364 Mac: 2c57.4192.8920 Session-IP: 10.0.15.202[5264] 10.0.15.200[5246] Disjoined DTLS close alert from peer
WLC#
Sep 1 19:41:56.844: %APMGR_TRACE_MESSAGE-4-WLC_APMGR_WARNING_MSG: Chassis 1 R0/0: wncd: Warning, AP APA4B4.392C.F364 is associated with the policy tag default-policy-tag, which has no wlan or rlan configured. Please configure wlan or rlan under the policy tag or associate the AP with valid policy tag
WLC#
Sep 1 19:41:56.845: %CAPWAPAC_SMGR_TRACE_MESSAGE-5-AP_JOIN_DISJOIN: Chassis 1 R0/0: wncd: AP Event: AP Name: APA4B4.392C.F364 Mac: 2c57.4192.8920 Session-IP: 10.0.15.202[5264] 10.0.15.200[5246] Ethernet MAC: a4b4.392c.f364 Joined