Any update on this?
I have the same issue. 90 APs out 100 were shown hold in the whitelist. Rebooting APs didn't help. Manually changed APs to factory certified state, still not up. APs are 104 and 135. Controller is 6.1.3.6.
Then upgraded controller to 6.4.2.12. Same. Deleting AP entry in the whitelist and rebooting AP, same issue. Controller keeps saying:
Nov 18 17:48:10 stm[2366]: <305048> <WARN> |stm| Dropping unsecure AP message code 16121 from AP at 192.168.17.253 (MAC address 6c:f3:7f:c2:a6:16)
Nov 18 17:47:52 sapd[832]: <311020> <ERRS> |AP TMPB01WA02@192.168.17.253 sapd| An internal system error has occurred at file sapd_redun.c function redun_retry_tunnel line 3233 error redun_retry_tunnel: Switching to clear. Error:RC_ERROR_IKEP1. Ipsec not successful after reboot.