Unattended Windows 7 install with non-DHCP DNS Server: Domain join fails, claiming it can't find the domain

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http://serverfault.com – I'm trying to build an unattended Windows 7 image script that will do a simple domain join. The catch is that the DHCP-provided DNS server knows absolutely nothing about my domain, so I need to set the DNS server to something that is aware of the domain before the UnattendedJoin task runs. I do this with a Microsoft-Windows-DNS-Client in the unattend.xml. I'm at the point where I know the DNS settings are being set, because the Local Area Connection NIC IP settings are correct once the Win7 machine comes up. However, it never makes it to the domain. The specific error reported is: [DJOIN.EXE (HowTos)