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Check the below article its for windows 2000 but you will get an idea.<br />
<br />
<a href="http://support.microsoft.com/kb/256938" rel="ugc nofollow">http://support.microsoft.com/kb/256938</a>
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Check the below article its for windows 2000 but you will get an idea.

http://support.microsoft.com/kb/256938 [http://support.microsoft.com/kb/256938]

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Hi<br />
<br />
We are running AD 2003. We have multiple domains within the same forest - emea.kam.com and apac.kam.com, forest root kam.com<br />
<br />
We have an application that will need to query AD to lookup attributes of users, their group membership and other info.<br />
<br />
What port does the app need to query the DC on - 386 (LDAP) or 3268 (GC)?
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Hi

We are running AD 2003. We have multiple domains within the same forest - emea.kam.com and apac.kam.com, forest root kam.com

We have an application that will need to query AD to lookup attributes of users, their group membership and other info.

What port does the app need to query the DC on - 386 (LDAP) or 3268 (GC)?

Application needs to lookup Active Directory info

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.

Active Directory

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).