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I have an intermittent problem. I have a trust relationship setup between 2 forests. Sometimes i can add users from trusted domain A to resource on domain B and sometimes i cant. it cant find the object. do you know why this behaviour is ? <br />
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Secondally do you know what DCs are required to be seen by the client PCs in domain A ? or do domain B's DC only talk to domain A's DCs ?
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I have an intermittent problem. I have a trust relationship setup between 2 forests. Sometimes i can add users from trusted domain A to resource on domain B and sometimes i cant. it cant find the object. do you know why this behaviour is ? 

Secondally do you know what DCs are required to be seen by the client PCs in domain A ? or do domain B's DC only talk to domain A's DCs ?

Trust relationship

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.