The RADIUS Username Password Credential Validator verifies credentials using the RADIUS protocol.
RADIUS supports strong authentication with both one-step (a combination of regular password and a one-time password in one field) and two-step (challenge-response) authentication. Two-step authentication is supported in the HTML Form Adapter.
If your RADIUS server is a Microsoft Network Policy Server (NPS), passwords containing special characters will not be encoded and decoded properly due to limitations with NPS.
RADIUS server messages are used by the HTML Form Adapter to determine the two-step authentication scenarios and to present a login screen to the end users.
On the Instance Configuration screen, configure per-instance settings that suit your use cases.