Azure AD Pass-Through Authentication (PTA) allows users to sign in to both on-premises and cloud-based applications using the same passwords. This feature is part of Azure Active Directory (AD) and helps organizations enforce their on-premises AD security and password policies in the cloud, thereby providing a seamless user experience while maintaining security.
Here's how Azure AD PTA works:
Integration with On-Premises AD: Azure AD PTA integrates with an organization's on-premises AD to apply the same security and password policies to cloud resources.
Authentication Request Handling: When a user signs in, the authentication request is passed through to the on-premises AD for validation.
Brute-Force Attack Protection: By enforcing the on-premises AD security policies, Azure AD PTA helps to filter out brute-force attacks.
No Passwords Stored in the Cloud: User passwords remain on-premises and are not stored in Azure AD, which enhances security.
Simple Sign-On Experience: Users enjoy a simple sign-on experience with the same set of credentials across on-premises and cloud services.
Reference:
Microsoft's documentation on deploying on-premises Microsoft Entra Password Protection, which works with Azure AD PTA1.
A step-by-step guide on implementing Azure AD Password Protection on-premises, which complements the PTA feature2.
An overview of Azure AD Password Protection and Smart Lockout features, which are part of the broader Azure AD security framework3.