![]() ![]() If you have an hybrid Azure AD and AD FS IdP then this is what it looks like: Azure AD, AD FS and MFA Server authenticating an Azure AD-hosted SaaS app. The cloud can’t really help with this use case today. In this case Azure MFA Server is mandatory – it’s no different to implementing any other MFA technology. Firstly, here’s the on-premises scenario – SaaS, AD FS and MFA Server. I’ll provide a couple of drawings, to illustrate what I’m talking about. ![]() more than two FS, will generally build out a load-balanced Azure MFA Server “farm” and utilise the Azure MFA “adapter” (the secondary authentication provider) to talk to Azure MFA Server via the load-balanced VIP (virtual IPv4 address). Smaller deployments can install the MFA Server component directly on the federation service (FS) servers larger deployments, i.e. ![]() In order to introduce Azure MFA into the authentication process for these apps you require a secondary authentication provider deployed within AD FS. That is, you have some Software-as-a-Service (SaaS) apps that authenticate via AD FS and not Azure AD. This is because you typically have relying party (RP) trusts established in your on-premises AD FS federation service. Today, implementing Azure Multi-Factor Authentication (MFA) in an hybrid identity and access management solution based on Azure Active Directory (Azure AD, AAD) and Active Directory Federation Services (AD FS) more often than not requires that you implement the on-premises Azure MFA Server component. ![]()
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