RDS + Windows 2012 Standard as DC + AD

Hi,

Before migraion whe had a SBS 2003 + Windows 2008 withoud AD + RDS. It worked fine.One told us RDS works on Windows 2012 with AD. So we installed on server to replace our 2 servers. What we done

- installed 2012 in SBS domein ( without AD ) + RDS : worked with some problems ( Mac clients needed iTap )

- migrate SBS 2003 to 2008 : failed to migrate directly to 2012. So 2008 and 2012 have now AD on it and are DC. We had some problems denoting SBS 2003

- but now RDS didn't work anymore on 2008 and 2012 servers ....

Does RDS work on a Domain Controller ( so we have one server only ) or have we to reconfigure completely our Windows 2008 server withoud AD ?

Thanks in advance

Regards

Dirk