Ok. I have used WSUS on Windows 2003 domain controllers in the past. Looking to see what if it is ok....recommended with Windows 208 R2.
According to the link below MS is saying there are problems using WSUS on a Windows 2008 R2 DC, wanted to ask if anyone is running a DC and WSUS without issues.
WSUS on Domain Controller – Windows 2008 R2,
WSUS is installed on a domain controller.
If WSUS is installed a domain controller, this will cause database access issues due to how the database is configured.
Installing WSUS on a domain controller can also cause problems upgrading or installing WSUS in the future.
Uninstall WSUS from the domain controller, demote the server to a non-domain controller, and reinstall WSUS.
Alternately, you can install WSUS on a different non-domain controller machine.
For detailed instructions about how to remove WSUS 3.0 SP2, see the Removal section in the Microsoft Support Article 972455: Description of Windows Server Update Services 3.0 Service Pack 2 (http://go.microsoft.com/fwlink/?LinkId=162639