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AP cannot associate with controllers

AP cannot associate with controllers

AP cannot associate with controllers

(OP)
Hi,

During the night 2 working APs disconnected from WLC and right now cannot get in back.
I downgreaded software - they connected to WLC get a new one and later cannot find them in WCS (AP are not associated with controller - an error message).

Into logs i can find this message:

Translating "CISCO-LWAPP-CONTROLLER"...domain server (255.255.255.255)

Translating "CISCO-CAPWAP-CONTROLLER"...domain server (255.255.255.255)

*Oct 11 11:31:28.064: %DTLS-5-SEND_ALERT: Send FATAL : Close notify Alert to 10.130.254.221:5246
*Oct 11 11:31:28.856: %CAPWAP-5-CHANGED: CAPWAP changed state to DISCOVERY
*Oct 11 11:31:28.857: %CAPWAP-5-CHANGED: CAPWAP changed state to DISCOVERY
*Oct 11 11:31:29.964:  status of voice_diag_test from WLC is false
*Oct 11 11:33:40.000: %CAPWAP-5-DTLSREQSEND: DTLS connection request sent peer_ip: 10.70.8.15 peer_port: 5246
*Oct 11 11:33:40.001: %CAPWAP-5-CHANGED: CAPWAP changed state to
*Oct 11 11:34:10.206: DTLS_CLIENT_ERROR: ../dtls/dtls_connection_db.c:2017 Max retransmission count reached!
*Oct 11 11:34:10.206: %DTLS-3-HANDSHAKE_RETRANSMIT: Max retransmit count for 10.70.8.15 is reached.
*Oct 11 11:34:40.065: %DTLS-5-SEND_ALERT: Send FATAL : Close notify Alert to 10.70.8.15:5246
*Oct 11 11:33:40.000: %CAPWAP-5-DTLSREQSEND: DTLS connection request sent peer_ip: 10.70.8.16 peer_port: 5246
*Oct 11 11:33:54.625: %CAPWAP-5-DTLSREQSUCC: DTLS connection created sucessfully peer_ip: 10.70.8.16 peer_port: 5246
*Oct 11 11:33:54.626: %CAPWAP-5-SENDJOIN: sending Join Request to 10.70.8.16
*Oct 11 11:33:54.626: %CAPWAP-5-CHANGED: CAPWAP changed state to JOIN
*Oct 11 11:33:59.625: %CAPWAP-5-SENDJOIN: sending Join Request to 10.70.8.16
*Oct 11 11:33:59.960: %CAPWAP-5-CHANGED: CAPWAP changed state to CFG


I do not use DHCP than Option 43 is not a solution. When i change controller IP to backup ... i can see Ap for a while in controller (wireless tab) but when i click on it , receive message: AP does not exist anymore.

Do you have any idea what happened ? why APs sudenly disconnected from controllers ?
Thank you in advance

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