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MohdArif-3014 avatar image
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MohdArif-3014 asked FanFan-MSFT commented

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

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

windows-active-directorywindows-server-2016
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Hi,
I am checking to see if the information provided was helpful.
If there's anything you'd like to know, don't hesitate to ask.

Best Regards,

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Hi,
As this thread has been quiet for a while,
Does this question has any update?
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Best Regards,

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FanFan-MSFT avatar image
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FanFan-MSFT answered

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://docs.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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Thameur-BOURBITA avatar image
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Thameur-BOURBITA answered

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

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