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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Handling Access-Challenge Message

To provide a two-step verification in addition to the username and password, NAS prompts for additional information. An Access-Challenge request is sent from the RADIUS server to NAS.

The RADIUS server returns one of the following responses:
  • Access-Challenge—If the user credentials are valid, the NAS server receives an Access-Challenge request from the RADIUS server.
  • Access-Accept—NAS validates the username and password. If the credentials are valid, the RADIUS server sends an Access-Request to the short message service one time password (SMS-OTP) daemon to generate an OTP. The OTP is sent to the user’s e-mail ID or mobile. If the OTP is valid, the RADIUS server authenticates the 2FA user and sends an Access-Accept response to NAS.
  • Access-Reject—NAS validates the OTP and if the OTP is invalid, the RADIUS server does not authenticate the user and sends an Access-Reject response to NAS.

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