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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesA trusted domain relationship lets one Windows/Active Directory domain accept another domain’s authentication decisions. It can enable a user account in one domain to be considered for access to a resource in another, but it does not grant that access by itself: the resource domain’s permissions still decide what the user may do.
What “trusted domain relationship” means
In Windows and Active Directory, a domain trust is a configured relationship in which one domain accepts another authority’s authentication decisions for security principals such as user accounts. The relationship supports authentication across domain boundaries.
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In a common resource-access scenario, the domain that contains the user account is the trusted domain: it is the authority the other domain relies on to authenticate that identity. The domain that contains the resource is the trusting domain: it accepts the trusted domain’s authentication decision when evaluating a request.
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How authentication crosses the domain boundary
When a user requests a resource in another domain, the resource domain can pass the authentication request to a domain controller in the account domain. Administrators establish the trust; domain controllers use trust-related secure-channel mechanisms to support communication between the domains. Microsoft’s protocol documentation describes a shared trust password used by domain controllers to compute a session key that protects secure-channel traffic. In a chain of transitive trusts, authentication can pass along the chain of secure channels.
Authentication is not authorization
A trust helps the resource domain validate an identity through another domain. It does not, on its own, give that identity permission to open a file, use an application, or administer a system. The resource domain still applies its access controls and permissions to decide whether the authenticated user can perform the requested action.
- Authentication: establishing who the user is.
- Authorization: checking whether that user has the rights needed for a particular resource or action.
For example, a valid account from a trusted domain may be recognized when it requests a file share in the trusting domain, yet still be denied if the share and file permissions do not grant that account or its groups access.
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Trust direction and transitivity are different
Trusts are described along two separate axes. Direction concerns which way authentication trust flows; transitivity concerns whether the relationship can extend beyond its two partners. A trust can therefore be one-way or two-way, and separately transitive or nontransitive.
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| Property | Type | Meaning |
|---|---|---|
| Direction | One-way | Authentication trust is available in one direction. State which domain’s perspective you mean when describing the direction. |
| Direction | Two-way | Both domains trust one another for authentication operations. |
| Transitivity | Transitive | The trust may extend through other domains that the trust partners trust. |
| Transitivity | Nontransitive | The trust is limited to its two partners. |
Direction terms such as “inbound” and “outbound” are relative to the domain from which the trust is being described. To avoid confusion, name the domain and explain which side accepts authentication from the other rather than using a direction label without context.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why organizations monitor trust changes
Creating or removing a domain trust may be part of approved enterprise administration, especially where organizations have connected environments. It is also a change worth reviewing if it was unexpected. Broadcom/Symantec security guidance describes monitoring trust creation and removal and treats unexplained activity as a potential sign of a serious domain-level compromise. That is vendor guidance, not a universal determination that every trust change indicates an incident.
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- Check whether the change matches an approved administrative task.
- Confirm the affected domains and the intended trust direction and scope.
- If it is unexplained, follow your organization’s security incident process.
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