unable to add forest in AD Sync server

Yasar mistry 251 Reputation points
2022-12-08T12:03:59.007+00:00

Hi Support,

We are facing issue with domain name,
we have domain called contoso without any dot com or dot local
so when i am trying to add forest in AD Sync server its asking FQDN name with users name like constos.com\administartor something like required but since our domain name is configure only constoso same like netbios name so due to we are getting error "Forest doesnt exists "
my question how to add forest in AD Sync sever if domain name is without Dots.

Please advise how do fix this issue

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  1. Andy David - MVP 141.5K Reputation points MVP
    2022-12-08T12:14:42.377+00:00

    Per this doc:
    While we strongly recommend against this network configuration (see article), using Azure AD Connect sync with a single label domain is supported, as long as the network configuration for the single level domain is functioning correctly. In SLD scenarios where the Active Directory NetBIOS domain name differs from the FQDN domain name, it's unsupported to install Azure AD Connect.

    Is that the case? Does the netbios match the single label domain?

    Microsoft does not recommend this config of course:
    https://learn.microsoft.com/en-US/troubleshoot/windows-server/networking/single-label-domains-support-policy

    If you cant get it to work, I would open a support case with Azure support

    https://learn.microsoft.com/en-us/azure/active-directory/hybrid/reference-connect-faq#are-single-label-domains--slds--supported---

    268573-image.png

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  2. Yasar mistry 251 Reputation points
    2022-12-08T12:20:38.68+00:00

    @Andy David thanks for your prompt reply, we have multi forest setup so one of the forest added in AD sync successfully and same ports use for another forest but another forest unable to add because i think in authentication its must required FQDN like constos.com but in our case our domain name is only constoso and Netbios name is also contoso so due to we are unable to add another second forest
    could you please advise what workaround we can perform to fix

  3. Andy David - MVP 141.5K Reputation points MVP
    2022-12-08T12:29:34.657+00:00

    Hi, you will need to open a case in your Azure portal. This forum is not paid support.

    https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request

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