Introducing Azure AD Pass-Through Authentication and Seamless Single Sign-on

Now in public preview, Azure AD Pass-Through Authentication is a 3rd alternative in the options for “single sign-on” between Active Directory and Azure AD.  Designed to remove the infrastructure requirements of AD Federation Services, it provides a more seamless SSO experience than the Password Hash Sync through AAD Connect.   

With the use of AAD Connect and a simple connector, AAD PTA relies on secure outbound communication to validate username  and password credentials against your on-premises Active Directory.  No need to sync AD passwords to AAD, nor deploy AD FS!

https://blogs.technet.microsoft.com/enterprisemobility/2016/12/07/introducing-azuread-pass-through-authentication-and-seamless-single-sign-on/

https://docs.microsoft.com/en-us/azure/active-directory/active-directory-aadconnect-pass-through-authentication

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