Symptom
A 9800 Wireless LAN Controller (WLC) may crash generating a system-report + corefile on process wncd
The following logs may also be found in the tracelogs before the crash:
2021/08/27 06:02:34.245373819 {wncd_x_R0-2}{1}: [capwapac-smgr-srvr] [19133]: UUID: XXXXXXXXX, ra: 5, TID: 0 (note): MAC: XXXX.XXXX.XXXX DTLS session create callback received.
2021/08/27 06:02:44.775217118 {wncd_x_R0-2}{1}: [capwapac-smgr-sess] [19133]: UUID: XXXXXXXXX, ra: 5, TID: 0 (note): MAC: XXXX.XXXX.XXXX Received CAPWAP join request
2021/08/27 06:02:48.626775185 {wncd_x_R0-2}{1}: [ewlc-dtls-sessmgr] [19133]: UUID: XXXXXXXXX, ra: 5, TID: 0 (note): Remote Host: x.x.x.x[5265] MAC: XXXX.XXXX.XXXX Received DTLS alert message, closing session..
2021/08/27 06:02:48.626906339 {wncd_x_R0-2}{1}: [ap-join-info-db] [19133]: UUID: XXXXXXXXX, ra: 5, TID: 0 (note): MAC: XXXX.XXXX.XXXX AP disconnect initiated. Reason: DTLS close alert from peer, Phase: Join
2021/08/27 06:02:48.626990211 {wncd_x_R0-2}{1}: [capwapac-smgr-sess] [19133]: UUID: XXXXXXXXX, ra: 5, TID: 0 (note): AP Name: xxxxxxxxxxx Mac: XXXX.XXXX.XXXX Session-IP: x.x.x.x[5265] x.x.x.x[5246] CAPWAP DTLS session closed for AP, cause: DTLS server session shutdown
Conditions
An AP sends DTLS alert before join request is processed
