I have setup a new Windows SBS 2011 standard. When I try to join the domain with a client computer running windows 7 pro I get this error message: Your computer could not be joined to the domain because the following error has occurred: An attempt to resolve the DNS name of a domain controller in the domain being joined has failed. Please verify this client is configured to reach a DNS server that can resolve DNS names in the target domain. For information about network troubleshooting, see windows Help. I can ping the domain server by IP address, but not domain name.