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Before reading this section, please read the following important note.
Note: As of July 1, 2019, Microsoft will no longer offer MFA Server for new deployments. New customers who would like to require multi-factor authentication from their users should use cloud-based Azure Multi-Factor Authentication. Existing customers who have activated MFA Server prior to July 1 will be able to download the latest version, future updates, and generate activation credentials as usual: https://docs.microsoft.com/en-us/azure/active-directory/authentication/howto-mfaserver-deploy. For new deployments, it is recommended to use Azure NPS Extension https://docs.microsoft.com/en-us/azure/active-directory/authentication/howto-mfa-nps-extension or Azure MFA Service along with SAML configuration in RAS.
Depending on the user location, there are four scenarios for the cloud MFA service:
Microsoft Entra ID
Yes
Microsoft Entra ID and on-premises AD using federation with AD FS (is required for SSO)
Yes
Yes
Microsoft Entra ID and on-premises AD using DirSync, Azure AD Sync, Azure AD Connect - no password sync
Yes
Yes
Microsoft Entra ID and on-premises AD using DirSync, Azure AD Sync, Azure AD Connect - with password sync
Yes
On-premises Active Directory
Yes
An Azure account with Global Administrator role is required to download and activate MFA Server. Syncing with Microsoft Entra ID (via AD Connect) or a custom DNS domain aren't required to setup an MFA Server which runs exclusively on-premises.
Users need to be imported into MFA Server and be configured for MFA authentication.
Parallels RAS authenticates users with MFA Server using the RADIUS second level authentication provider. MFA Server thus needs to be configured to allow RADIUS client connections from the RAS server.
The authentication process goes through the following stages:
In stage 2 the user can be authenticated using either RADIUS or Windows AD. A prompt to enter the credentials twice (in stage 1 and 6) is avoided by enabling the option to forward the password.
