Cisco AP 無法join WLC 2504

擴增AP，出現下列錯誤訊息

Certificate chain validation has failed. The certificate (SN: 4E78A210000000000007) has expired.

*Aug 6 16:48:55.095: Using SHA-2 signed certificate for image signing validation.
*Aug 6 16:48:55.163: %PKI-3-CERTIFICATE_INVALID_EXPIRED: Certificate chain validation has failed. The certificate (SN: 4E78A210000000000007) has expired. Validity period ended on 21:43:46 UTC Dec 4 2022
*Aug 6 16:48:55.167: Image signing certificate validation failed (1A).

*Aug 6 16:48:55.167: Failed to validate signature
*Aug 6 16:48:55.167: Digital Signature Failed Validation (flash:/update/ap3g2-k9w8-mx.153-3.JBB/final_hash)
*Aug 6 16:48:55.167: AP image integrity check FAILED
Aborting Image Download

在WLC 有看到AP join 但是一直呈現download image

解決方式:

如果有設定NTP 先把設定拿掉，然後重新設定日期為2022/12/2 00:00:00 後等待ap 完成下在image 及join wlc 後

即可將日期調整回正確時間

PS:將日期調成過去時間部會影響目前正在運作的AP

參考:

https://www.cisco.com/c/en/us/support/docs/wireless/aironet-700-series-access-points/218447-ios-ap-image-download-fails-due-to-expir.html#toc-hId—1248621172