Troubleshooting Tip: 'The client could not be authenticated because the Extensible Authentication Protocol (EAP) Type cannot be processed by the server.' error for RADIUS server logs when client failed to connect to Wi-Fi SSID

[SAJUDIYA]

Description	This article describes an issue with the RADIUS server EAP type that cannot be processed by the server when the user connects to the Wi-Fi SSID. While checking RADIUS server logs, the following logs were observed for the user: Error logs from Windows: RADIUS Client: Client Friendly Name: test Client IP Address: 10.x.x.x  Authentication Details: Connection Request Policy Name: Use Windows authentication for all users Network Policy Name: Wireless Authentication Provider: Windows Authentication Server: xxx.domain.com Authentication Type: EAP EAP Type: - Account Session Identifier: 36363643393238373030314536323245 Logging Results: Accounting information was written to the local log file. Reason Code: 22 Reason: The client could not be authenticated because the Extensible Authentication Protocol (EAP) Type cannot be processed by the server.
Scope	All versions of FortiOS.
Solution	Make sure that the following settings matched under certificate Authority(local) where RADIUS server is configured: Make sure that the certificate is valid. If not, renew it on the NPS server. If the same issue persists, it is possible a local certificate stored on the server hard drive is corrupted. It is therefore necessary to create a new NPS server, which should resolve the issue.