My computer has installed Winserver 2008 R2

First, I install TMG Forefront 2010 thereafter I upgrated domain controller. 

The other computer I try to join domain but it's not success. have a notice : DNS have problem .

How do it that ? 

help me

Hi,

Please create a Firewall policy rule to allow the required ports for AD authentication from the other computers to the DC based on following guide:

Resource Guide for Microsoft Active Directory Communications and ISA Server Firewalls

Active Directory and Active Directory Domain Services Port Requirements

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Best Regards,

Joyce

Hi

I followed your way . But it's not success

Hi,

What is the error in the TMG logging? Please post it to this thread.

Best Regards,

Joyce

I created a Firewall policy rule to allow the required ports for AD authentication from the other computers to the DC. 

I follow your link . But when Client join domain. I still see problem about DNS. Client can't find domain.

Hi,

How do you configure the TMG firewall to use DNS server? Is the TMG firewall in a workgroup?

Please check the blog below that describes how to configure DNS settings in different scenarios.

TMG Firewall Name Resolution (Part 3)

Note: Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

Best Regards,

Joyce