Domain trust

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.
nav2567Asked:
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Cliff GaliherCommented:
Ping isn't a good test for this. Many routers block all ICMP traffic, and many server admins configure windows firewall to block ICMP/ping from all machines or all non-local subnets.

The appropriate windows tool to test DNS is nslookup.

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nav2567Author Commented:
I use nslookup and set the domain=their domain.  I am not able to see any IP being resolved when i type the hostname of their domain controller or their domain.
nav2567Author Commented:
thanks.
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Windows Server 2012

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