When attempting to connect a vCenter server to Active Directory I got an error that I had to enter a fully qualified domain name in the Domain field, which I had done. So why the error. I started checking the following areas.
Domain Resolution - does the domain resolve back to one of the domain controllers. In my case I could ping and perform an nslookup on the domain and it resolved fine.
The success of a deployment of new computers in a business environment has allot to do with the process and being consistent with that process. Getting the steps out of order may cause some issue that were not expected nor will you know why one computer works fine and another doesn't.
Below is a list of steps that we often follow for deploying new computers in a business environment that has a Windows domain controller.