Summary: By default, AD integrated DNS is configured to wait for AD sync to complete, which could cause problems in situations where you're rebuilding your environment and don't have all AD Domain Controllers yet available.
Date: Around 2016
Refactor: 9 January 2025: Checked links and formatting.

When working with isolated environments, for example testenvironmentsetup and Site Recovery Manager testing, we sometimes ran into problems with DNS. We found that with isolated environments DNS sometimes is waiting for AD sync to complete. According to this MS kb article you can disable that by creating the following registry key on the DC/DNS server:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NTDS\Parameters
 Value name:  Repl Perform Initial Synchronizations
 Value type:  REG_DWORD
 Value data: 0

Note: This configuration change is not recommended for use in production environments or in any environment on an ongoing basis!

After this I restarted the Active Directory Domain Services and everything works.