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I use nslookup and set the domain=their domain. &nbsp;I am not able to see any IP being resolved when i type the hostname of their domain controller or their domain.
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We need to setup a one-way AD trust to a domain in another company via a private connection. <br />
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In our DNS, we create a conditional forwarder by specifying the domain of the other company and also an IP address of their domain controller. &nbsp;<br />
<br />
We are still not be able to resolve their domain name when we ping. &nbsp;The server FDQN is still not be resolved in this conditional forwarder's properties. &nbsp;<br />
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The required firewall ports being specified in this link <a href="https://support.microsoft.com/en-us/kb/179442#method3" rel="ugc">https://support.microsoft.com/en-us/kb/179442#method3</a>&nbsp;are already opened <br />
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Please advise what we should check. &nbsp;<br />
<br />
Thanks.
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We need to setup a one-way AD trust to a domain in another company via a private connection. 

In our DNS, we create a conditional forwarder by specifying the domain of the other company and also an IP address of their domain controller.  

We are still not be able to resolve their domain name when we ping.  The server FDQN is still not be resolved in this conditional forwarder's properties.  

The required firewall ports being specified in this link https://support.microsoft.com/en-us/kb/179442#method3 are already opened 

Please advise what we should check.  

Thanks.

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Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

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