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Unable to join Windows 7 Workstation to SBS 2008 Domain

“Your computer could not be joined to the domain because : An attempt to resolve the DNS name of a domain controller in the domain being joined has failed.”

We run into this error a lot on improperly configured SBS 2008 domain servers. The issue usually has to do with improper DHCP settings on the domain controller – where an external DNS is listed before the domain controller’s IP address in your IPv4 settings. Check that your domain controller is listed as your primary DNS server – for instance DNS settings should look like this on your client computer :