Hi dear I have this problem

[Sadiq Qasemi]

I unpluged the cisco AP port and again I pluged it but The AP can not join the WLC

*Feb 28 04:15:04.001: %DTLS-5-SEND_ALERT: Send FATAL : Close notify Alert to 172.17.5.3:5246
*Feb 28 04:15:04.102: %CAPWAP-5-AP_EASYADMIN_INFO: AP Easy Admin information - EASY_ADMIN is not set, turn off easy admin service!

*Feb 28 04:15:04.102: %CAPWAP-5-AP_EASYADMIN_INFO: AP Easy Admin information - Easy Admin is not enabled, turn it off!

*Feb 28 04:15:04.121: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio0 due to the reason code 39
*Feb 28 04:15:04.121: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio1 due to the reason code 39
*Feb 28 04:15:04.193: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to down
*Feb 28 04:15:04.209: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
*Feb 28 04:15:05.193: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Feb 28 04:15:05.219: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Feb 28 04:15:05.225: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to down
*Feb 28 04:15:05.231: %LINK-5-CHANGED: Interface Dot11Radio1, changed state to reset
*Feb 28 04:15:06.219: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
*Feb 28 04:15:06.225: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio1, changed state to down
*Feb 28 04:15:06.250: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to up
*Feb 28 04:15:07.251: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio1, changed state to up
*Feb 28 04:15:13.000: %CAPWAP-5-DTLSREQSEND: DTLS connection request sent peer_ip: 172.17.5.3 peer_port: 5246
*Feb 28 04:15:13.000: DTLS_CLIENT_ERROR: ../capwap/base_capwap/dtls/base_capwap_dtls_handshake.c:94 First fragment for seq 2 is missing
*Feb 28 04:15:13.000: DTLS_CLIENT_ERROR: ../capwap/base_capwap/dtls/base_capwap_dtls_handshake.c:94 First fragment for seq 2 is missing
*Feb 28 04:15:13.000: DTLS_CLIENT_ERROR: ../capwap/base_capwap/dtls/base_capwap_dtls_handshake.c:94 First fragment for seq 2 is missing
*Feb 28 04:15:13.003: DTLS_CLIENT_ERROR: ../capwap/base_capwap/dtls/base_capwap_dtls_handshake.c:94 First fragment for seq 2 is missing
*Feb 28 04:15:13.261: %CAPWAP-5-DTLSREQSUCC: DTLS connection created sucessfully peer_ip: 172.17.5.3 peer_port: 5246
*Feb 28 04:15:13.261: %CAPWAP-5-SENDJOIN: sending Join Request to 172.17.5.3
*Feb 28 04:15:18.262: %CAPWAP-5-SENDJOIN: sending Join Request to 172.17.5.3

[Gabriela Godoi do Prado]

POSTED IN BEHALF OF @Rich R

Hi @Sadiq Qasemi.
Note your post is locked so we can’t reply directly.  Community managers are investigating and that’s why this reply is posted by them.

Your post doesn’t have enough information to really assist you.  At an absolute minimum we need to see the following:

• WLC model
• WLC software version
• AP model
• Complete console log from the AP from power on

Check the links in my signature below and that might solve your problem for you:

___________________________________________
TAC recommended codes for AireOS WLC's
Best Practices for AireOS WLC's
TAC recommended codes for 9800 WLC's
Best Practices for 9800 WLC's
Cisco Wireless compatibility matrix
Field Notice: FN-72424 Later Versions of WiFi 6 APs Fail to Join WLC - Software Upgrade Recommended
WARNING - see CSCwd37092 Throughput degraded after upgrading to code 8.10.181.0/17.3.6 - 2800/3800/4800 series
- The fix for CSCwd37092 is now released in 8.10.183.0 and
- For IOS-XE 17.3.6 select controller model, go to IOS XE Software AP Service Pack, select CSCwd40096 17.3.6 APSP2
Field Notice: FN-63942 Lightweight APs and WLCs Fail to Create CAPWAP Connections Due to Certificate
                      Expiration - Software Upgrade Recommended
Field Notice: FN-72524 - During Software Upgrade/Downgrade IOS APs Might Remain in Downloading State
                     After 4 Dec 2022 Due to Certificate Expiration - Fixed in 8.10.183.0 and 17.3.6 APSP5 (APSP_CSCwd83653)
                     Also fixed in 8.5.182.7 (8.5 mainline) and 8.5.182.105 (8.5 IRCM) if you can't upgrade to 8.10
                     Note that 8.10.181.0 and 8.10.182.0 have been deferred (withdrawn) and are effectively unsupported by Cisco
___________________________________________
Richard R”

[Rich R]

Looks like @Tyler Langston has managed to unlock this post - thanks Tyler - so I can reply directly now.

@Sadiq Qasemi you need to provide at least 

• WLC model
• WLC software version
• AP model
• Complete console log from the AP from power on

Up to date version of my signature below ...

[marce1000]

             - FYI : https://bst.cloudapps.cisco.com/bugsearch/bug/CSCul08933

 M.