Why does authentication always fail if the AAA authentication mode is RADIUS, and the AR router configuration under the RADIUS template and the user configuration on the RADIUS server are correct

1

Possible causes are as follows:
1. The IP address of a client is not configured on the RADIUS server; therefore, the server does not respond to an authentication packet.
2. The shared keys configured on the router and RADIUS server are inconsistent.

Other related questions:
Why does authentication fail when the RADIUS server template is correct and the AAA authentication mode is RADIUS
The possible causes are as follows: 1. The client's IP address is not configured on the server, the IP address is configured incorrectly, and the RADIUS server does not respond to authentication packets. 2. The shared keys on the AR and RADIUS server are different. 3. The user configuration of the RADIUS server is incorrect.

Why does RADIUS authentication fail when the RADIUS server template and RADIUS server are properly configured
This problem has the following possible causes: -The IP address of the router (a RADIUS client) is not configured on the RADIUS server, so the RADIUS server cannot send an authentication response packet to the router. -Different shared keys are configured on the router and the RADIUS server.

Both RADIUS authentication and local authentication are configured. Is local authentication performed when RADIUS authentication fails
The AR first performs RADIUS authentication. If RADIUS authentication fails, the AR does not perform local authentication. The AR performs local authentication only when the RADIUS server has no response.

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