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

Mohd Arif 871 Reputation points
2021-05-01T07:44:57.703+00:00

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

Active Directory
Active Directory
A set of directory-based technologies included in Windows Server.
3,619 questions
Windows Server 2016
Windows Server 2016
A Microsoft server operating system that supports enterprise-level management, data storage, applications, and communications.
1,760 questions
{count} votes

2 answers

Sort by: Most helpful
  1. BOURBITA Thameur 12,086 Reputation points Microsoft MVP
    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

    No comments

  2. Fan Fan 15,061 Reputation points
    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,

    No comments