![]() ![]() What happens when the user’s default method is a push notification or a phone call? How does the user receive the request? ![]() So, when the Azure MFA service goes to invoke the MFA request from the NPS extensions, it looks up the user’s MFA details and invokes the MFA challenge using that method. In this scenario, the user has set their default method to one of the notification methods, such as Microsoft Authenticator or phone calls. And if they have more than one authentication method, they can set one of them as their default method. When the Azure MFA extension goes to invoke Azure MFA, it authenticates to Azure Active Directory using that certificate to authenticate and open a secure connection to send a request to invoke the default MFA authentication for that user. When the NPS server administrator installed the Azure MFA NPS extension on the server, the process registered itself in the associated Azure Active Directory, which issued a certificate identifying the specific instance. And then once authenticated, the secondary step is to invoke the MFA challenge using the Azure MFA service before returning the response to the VPN server. The primary authentication using NPS is against the on-premises Active Directory. To use MFA there are two steps to the authentication process for the user. And if that is successful, it will then invoke MFA for the user. ![]() The NPS server now uses the credentials in that request to validate the password against Active Directory. And it waits for a response to determine if the user is authenticated to access the service or not. Now that the user has provided their username and password to the VPN client to the VPN service, the VPN server now presents that credential pair to the NPS server as a RADIUS request to authenticate the user. ![]() The user opens the VPN client, is presented with a dialog box requesting the user to enter their username and credential. In this scenario, the user is wanting to connect to the corporate network via VPN. And they have decided they want to provide additional security by using the Azure MFA feature of Azure Active Directory. In the above illustration, we have a typical scenario where a customer has deployed their VPN network access services using RADIUS. ![]()
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