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Where clients will go for authentication if their Site DC is failed

Mohd Arif 926 Reputation points
2021-05-01T07:44:57.703+00:00

If siteA gets fail which DC will provide authentication to siteA client?

Windows Server 2016
Windows Server 2016
A Microsoft server operating system that supports enterprise-level management updated to data storage.
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Active Directory
Active Directory
A set of directory-based technologies included in Windows Server.
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2 answers

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  1. Thameur-BOURBITA 32,636 Reputation points
    2021-05-01T10:20:36.143+00:00

    Hi,

    If the DC in same client site is offline , the client will contact an other domain controller in other site .

    If the site doesn't have any domain controller , the client will based on site link cost to define the closest domain controller for authentication.

    determining-the-cost

    Please don't forget to mark helpful reply as answer

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  2. Fan Fan 15,326 Reputation points Microsoft Vendor
    2021-05-03T00:01:58.627+00:00

    Hi,

    Based on my research, DC Locator uses the following algorithm to locate a domain controller by default:
    Try to find a domain controller in the same site.
    If no domain controller is available in the same site, try to find any domain controller in the domain.

    If you enable the Try Next Closest Site setting, DC Locator uses the following algorithm to locate a domain controller:
    Try to find a domain controller in the same site.
    If no domain controller is available in the same site, try to find a domain controller in the next closest site. A site is closer if it has a lower site-link cost than another site with a higher site-link cost.
    If no domain controller is available in the next closest site, try to find any domain controller in the domain.

    For more information, you can refer to the following link:
    https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/plan/enabling-clients-to-locate-the-next-closest-domain-controller
    Best Regards,

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