Why Is the Log Indicating that the RADIUS Server Is Down Generated When the User Uses a Local Account to Log in to the device?

Created Apr 05, 2017 10:53:18Latest reply Apr 05, 2017 17:32:45 720 1 0 0
Why Is the Log Indicating that the RADIUS Server Is Down Generated When the User Uses a Local Account to Log in to the device?
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Adamcolob     Created Apr 05, 2017 17:32:45 Helpful(0) Helpful(0)

The NAS sends a request to the RADIUS server, but the RADIUS server does not respond to the request. Then, the NAS sends requests to the RADIUS server at specific intervals. If the NAS receives no response after several request attempts, the NAS considers that the RADIUS server is Down. If local authentication is configured, local authentication is alternatively adopted at this time.

When a correct user account but an incorrect password are used by a user to log in, the RADIUS server responds, which prevents local authentication, by directly denying the login of the user.

The RADIUS server is not Down (the RADIUS server functions normally and is reachable), but does not respond to the requests of the NAS (the debugging information displays this event). The possible causes are as follows: The RADIUS server is too busy to respond; the RADIUS server fails to match the account that is used by the user to log in and thus does not respond.

If the RADIUS server does not respond, the router considers that the RADIUS server is Down and alternatively adopts local authentication. If the RADIUS server responds by denying the login of the user, the router does not adopt local authentication.

It is probably because the RADIUS server ignores the requests to protect against attacks. As a result, the router receives no response and considers that the RADIUS server is Down.
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