The 9120 AP needs to have the CA certificate as trusted certificate so that it can connect to the RADIUS server and authenticate as Dot1x supplicant.
Could you advise how to upload the CA certificate to the AP ?. The WLC is a 9800.
Go to Solution.
Here is one for the 9800
Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide, Cisco IOS XE Gibraltar 16.10.x - 802.1x Support [Cisco Catalyst 9800 Series Wireless Controllers] - Cisco
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This has not changed in a while, so you should review it and make sure its what you want to do:
Configure Lightweight Access Point as an 802.1x Supplicant - Cisco
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