We have moved our active directory and dns server from a windows 2003 server to a 2012 server. I removed the dns server role from the 2003 server and the AD role from it as well. However, I had to manually set each machine in our building to point to the new dns server IP address.
There has to be something I missed, even though I slavishly followed the steps recommended by Microsoft's technet to do this move. I am OK with having to set this manually in this small environment, but I would much rather know why the issue is happening and how to fix it.