I had a Windows Server 2003 SP1 Domain Controller on our domain and it was listed on many member servers as the primary DNS server. These same servers also had one of our other domain controllers listed as the secondary DNS server that is a Windows Server 2008 R2 SP1 domain controller.
I removed the Windows Server 2003 domain controller and replaced it with the Windows 2008 R2 domain controller. The issue that I had is that when the 2003 server was decommissioned a few of the other member servers never started using the secondary DNS server for resolution (the majority of them did). I had to go to those servers and change the primary DNS server entry to another DNS server to resolve this issue until I had the new Windows Server 2008 domain controller up and running.
My question is this. Why did these servers never attempt to use the secondary DNS server?
Any help with this would be greatly appreciated.
Leonard Hoffman