We are currently running a DC on SBS 2011 Standard. We just picked up Windows Server 2012 R2 and want to add it to the domain. We intend to use Server 2012 R2 as a SQL server.
We seem to be running into Windows Update issues after joining into the domain, where it wouldn't be able to check for updates (There should be a lot as it is a new install). If I leave the domain and update Windows 2012, the updates are able to be downloaded and installed without problems. Are there additional steps we need to perform to add Server 2012 R2 to SBS 2011 Standard?