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No, they can't be disabled.
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I was was correct in stating this is on by default? The purpose of referrals it to reach out to other LDAP servers to find an object if not present on the current server because of replication. Is this correct?
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Yes, it is on by default.<br />
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If they want to NOT receive referrals, then tell them to connect to the GC (global catalog) port, not the LDAP port.
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compdigit44

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We have a Windows 2012 R2 domain with 8 DC's. We have a third party app being setup with LDAP and needs to set if referral are enabled or not in the domain. From my understanding, referrals are enabled by default in AD and cannot be disabled. Is this correct?
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We have a Windows 2012 R2 domain with 8 DC's. We have a third party app being setup with LDAP and needs to set if referral are enabled or not in the domain. From my understanding, referrals are enabled by default in AD and cannot be disabled. Is this correct?

Active Directory LDAP Referrals

Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.

Windows Server 2012

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.