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What is Azure AD Pass-through Authentication
Find out how pass-through authentication adds a 3rd option for authentication with Azure AD.
John Savill
December 28, 2016
1 Min Read
Q. What is Azure AD Pass-through Authentication?
A. Traditionally there have been two authentication options for Azure AD:
Authenticate in Azure by having the passwords for accounts stored in Azure AD (for on-premises replicated accounts a hash of the password hash is replicated to Azure AD by Azure AD Connect)
Authenticate on-premises by federating Azure AD with on-premises AD which requires a federation solution deployed on-premises such as ADFS
The new Azure AD Pass-through Authentication works as a feature of the new Azure AD Connect to enable authentication requests to Azure AD to be performed against on-premises Active Directory without having to deploy federation infrastructure. When an authentication is required it is placed on a queue with the username/password entered and then the agent that runs on-premises checks the queue, takes the request (fully encrypted during transport) then responds with success or failure.
More information can be found at https://docs.microsoft.com/en-us/azure/active-directory/connect/active-directory-aadconnect-pass-through-authentication.
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