Why does the server checking error occur during RADIUS dynamic authentication

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This error occurs because the RADIUS authentication server is not configured properly.

Other related questions:
Why does server check fail when RADIUS dynamic authorization is used on an AR
The RADIUS server address is not configured on the AR.

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.

An Error Occurs During the LDAP Server Component Installation
In the CLI, run the reboot command to restart the LDAP server.

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.

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