What does the error code 215 on ClearPass mean ? And its possible solution.

For one of our customer, we are implementing 802.1X solution for wired and wireless clients, for windows, domain joined devices. WLAN : Cisco WLC RADIUS cert : Signed by public CA. 802.1X configuration on client : Through GPO   During implementation we came across a TLS session error as shown below: All the client got [...]