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Thursday, November 21, 2019

Fix "The Active Directory Domain Controllers required to find the selected objects in the following domains are not available" error in AD trust scenario

Hello,

If you have set up an Active Directory forest trust but you cannot browse users in trusted domain because of error "The Active Directory Domain Controllers required to find the selected objects in the following domains are not available", then most likely you have not configured networks ports correctly.


Usually when I configure AD trusts, I take this article https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/dd772723(v=ws.10) to allow necessary firewall ports.

In addition to ports mentioned in this article we also had to open TCP port 135 to be able to browse users in trusted forest.
I don't know exactly but I suspect that this was due to fact that trusted forest was still using Windows Server 2003 Forest functional level.

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