![]() Creating a certificate for each server means that you can update each cert individually, and not worry about downtime across all your servers. If you do install multiple servers, you should use a difference client certificate for each one of them. You can create as many Azure AD Multi-Factor Authentication-enabled NPS servers as you need. ![]() The NPS extension automatically handles redundancy, so you don't need a special configuration. This is expected behavior, and doesn't indicate a problem with the NPS server or Azure AD Multi-Factor Authentication NPS extension. To avoid this timing condition, the Azure AD Multi-Factor Authentication NPS extension continues to filter and discard duplicate requests for up to 10 seconds after a successful response has been sent to the VPN server.Īgain, you may see discarded requests in the NPS server event logs, even when the Azure AD Multi-Factor Authentication prompt was successful. If needed, or to reduce discarded requests in the event logs, you can increase the VPN server timeout value to 90 or 120 seconds.ĭue to this UDP protocol behavior, the NPS server could receive a duplicate request and send another MFA prompt, even after the user has already responded to the initial request. To minimize discarded requests, we recommend that VPN servers are configured with a timeout of at least 60 seconds. Discarded requests in the NPS server event log don't indicate there's a problem with the NPS server or the Azure AD Multi-Factor Authentication NPS extension. This behavior is by design to protect the end user from getting multiple requests for a single authentication attempt. If you look at the NPS server logs, you may see these additional requests being discarded. The NPS server discards these duplicate VPN server requests. In this situation, the NPS server identifies additional VPN server requests as a duplicate request. The user may not have successfully responded to the MFA prompt, so the Azure AD Multi-Factor Authentication NPS extension is waiting for that event to complete. The NPS server may not respond to the VPN server's original request before the connection times out as the MFA request may still be being processed. If the connection times out, the VPN server sends the request again. In the authentication scenario in this article, VPN servers send the request and wait for a response. If so, the packet is resent as the sender assumes the packet didn't reach the destination. After a period of time, the connection may time out. RADIUS protocol behavior and the NPS extensionĪs RADIUS is a UDP protocol, the sender assumes packet loss and awaits a response. ![]() ![]() The following diagram illustrates this high-level authentication request flow: Without a TOTP method registered, users continue to see Approve/ Deny.Īzure AD MFA communicates with Azure Active Directory (Azure AD) to retrieve the user's details and performs the secondary authentication using a verification method configured to the user. Users must have a TOTP authentication method registered to see this behavior. 1 or later will be prompted to sign in with a TOTP method instead. TOTP sign-in provides better security than the alternative Approve/ Deny experience.Īfter May 8, 2023, when number matching is enabled for all users, anyone who performs a RADIUS connection with NPS extension version. Once the extension receives the response, and if the MFA challenge succeeds, it completes the authentication request by providing the NPS server with security tokens that include an MFA claim, issued by Azure STS.Īlthough NPS doesn't support number matching, the latest NPS extension does support time-based one-time password (TOTP) methods, such as the TOTP available in Microsoft Authenticator. NPS Extension triggers a request to Azure AD Multi-Factor Authentication for the secondary authentication. ![]() NPS Server connects to Active Directory Domain Services (AD DS) to perform the primary authentication for the RADIUS requests and, upon success, passes the request to any installed extensions. NAS/VPN Server receives requests from VPN clients and converts them into RADIUS requests to NPS servers. When you use the NPS extension for Azure AD Multi-Factor Authentication, the authentication flow includes the following components: The NPS extension acts as an adapter between RADIUS and cloud-based Azure AD Multi-Factor Authentication to provide a second factor of authentication for federated or synced users. With the NPS extension, you can add phone call, text message, or phone app verification to your existing authentication flow without having to install, configure, and maintain new servers. The Network Policy Server (NPS) extension for Azure AD Multi-Factor Authentication adds cloud-based MFA capabilities to your authentication infrastructure using your existing servers. ![]()
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