Active directory trust setup

Active Directory Domain Services (AD DS) provides security across multiple domains or forests through tên miền & forest trust relationships. Before authentication can occur across trusts, Windows must first kiểm tra if the tên miền being requested by a user, computer, or service has a trust relationship with the domain of the requesting tài khoản.

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To kiểm tra for this trust relationship, the Windows security system computes a trust path between the domain name controller (DC) for the server that receives the request & a DC in the domain of the requesting account.

The access control mechanisms provided by AD DS & the Windows distributed security Mã Sản Phẩm provide an environment for the operation of domain name and forest trusts. For these trusts to lớn work properly, every resource or computer must have a direct trust path khổng lồ a DC in the tên miền in which it is located.

The trust path is implemented by the Net Logon service using an authenticated remote procedure Call (RPC) connection to lớn the trusted domain authority. A secured channel also extends to lớn other AD DS domains through interdomain name trust relationships. This secured channel is used khổng lồ obtain và verify security information, including security identifiers (SIDs) for users và groups.

For an overview of how trusts apply khổng lồ Azure AD DS, see Resource forest concepts & features.

To get started using trusts in Azure AD DS, create a managed tên miền that uses forest trusts.

Trust relationship flows

The flow of secured communications over trusts determines the elastiđô thị of a trust. How you create or configure a trust determines how far the communication extends within or across forests.

The flow of communication over trusts is determined by the direction of the trust. Trusts can be one-way or two-way, & can be transitive or non-transitive.

The following diagram shows that all domains in Tree 1Tree 2 have transitive sầu trust relationships by default. As a result, users in Tree 1 can access resources in domains in Tree 2 & users in Tree 1 can access resources in Tree 2, when the proper permissions are assigned at the resource.


One-way & two-way trusts

Trust relationships enable access to resources can be either one-way or two-way.

A one-way trust is a unidirectional authentication path created between two domains. In a one-way trust between Domain A and Domain B, users in Domain A can access resources in Domain B. However, users in Domain B can"t access resources in Domain A.

Some one-way trusts can be either non-transitive sầu or transitive depending on the type of trust being created.

In a two-way trust, Domain A trusts Domain B and Domain B trusts Domain A. This configuration means that authentication requests can be passed between the two domains in both directions. Some two-way relationships can be non-transitive sầu or transitive sầu depending on the type of trust being created.

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All tên miền trusts in an AD DS forest are two-way, transitive trusts. When a new child domain is created, a two-way, transitive trust is automatically created between the new child domain & the parent domain name.

Transitive và non-transitive trusts

Transitivity determines whether a trust can be extended outside of the two domains with which it was formed.

A transitive sầu trust can be used to extover trust relationships with other domains.A non-transitive sầu trust can be used to lớn deny trust relationships with other domains.

Each time you create a new domain in a forest, a two-way, transitive sầu trust relationship is automatically created between the new tên miền and its parent tên miền. If child domains are added to lớn the new domain, the trust path flows upward through the domain hierarchy extending the initial trust path created between the new domain and its parent domain name. Transitive trust relationships flow upward through a domain tree as it is formed, creating transitive trusts between all domains in the domain name tree.

Authentication requests follow these trust paths, so accounts from any domain in the forest can be authenticated by any other tên miền in the forest. With a single sign in process, accounts with the proper permissions can access resources in any domain in the forest.

Forest trusts

Forest trusts help you to manage a segmented AD DS infrastructures & support access to lớn resources & other objects across multiple forests. Forest trusts are useful for service providers, companies undergoing mergers or acquisitions, collaborative business extranets, and companies seeking a solution for administrative sầu autonomy.

Using forest trusts, you can links two different forests to lớn size a one-way or two-way transitive sầu trust relationship. A forest trust allows administrators to connect two AD DS forests with a single trust relationship khổng lồ provide a seamless authentication và authorization experience across the forests.

A forest trust can only be created between a forest root tên miền in one forest và a forest root domain in another forest. Forest trusts can only be created between two forests & can"t be implicitly extended to lớn a third forest. This behavior means that if a forest trust is created between Forest 1 and Forest 2, and another forest trust is created between Forest 2 & Forest 3, Forest 1 doesn"t have sầu an implicit trust with Forest 3.

The following diagram shows two separate forest trust relationships between three AD DS forests in a single organization.


This example configuration provides the following access:

Users in Forest 2 can access resources in any domain name in either Forest 1 or Forest 3Users in Forest 3 can access resources in any domain name in Forest 2Users in Forest 1 can access resources in any domain name in Forest 2

This configuration doesn"t allow users in Forest 1 to lớn access resources in Forest 3 or vice versa. To allow users in both Forest 1Forest 3 khổng lồ nói qua resources, a two-way transitive sầu trust must be created between the two forests.

If a one-way forest trust is created between two forests, members of the trusted forest can utilize resources located in the trusting forest. However, the trust operates in only one direction.

For example, when a one-way, forest trust is created between Forest 1 (the trusted forest) and Forest 2 (the trusting forest):

Members of Forest 1 can access resources located in Forest 2.Members of Forest 2 can"t access resources located in Forest 1 using the same trust.