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Add subdomain without connection to root domain

Moataz Shaaban 1 Reputation point
2020-07-08T09:20:55.397+00:00

Hello,

I want to add child domain to ad connect but for some reasons I won't able to use enterprise admin and ad connect server can't communicate with root domain

when I try to add the child domain I got this error :

Cannot establish a connection to the Domain Controller(s) associated to a forest named: 'domain.com'.

the error also happen if I wrote the forest name as there's no communication between the AD connect server and root domain,so I was looking for away to just add the subdomain

Microsoft Entra ID
Microsoft Entra ID
A Microsoft Entra identity service that provides identity management and access control capabilities. Replaces Azure Active Directory.
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  1. AmanpreetSingh-MSFT 56,441 Reputation points
    2020-07-08T11:40:17.007+00:00

    @MoatazShaaban-9684 In AD Connect, the only option is to add entire forest. You cannot add a specific subdomain in the forest to AD Connect. The AD Connect server must be able to communicate to the root domain in order to add the forest. You may fix the connectivity with one of the DCs in the root domain and configure your AD Connect server to communicate to that specific DC by configuring below option.

    11520-preferreddc-1.png

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