Windows 2012 에서 mstsc 멀티 접속을 하려고 하니 안됨.
그래서 아래 셋팅을 변경함.
1. gpedit.msc and open it
2. Computer configuration -> Administrative Tempalates -> Wondows Components ->Remote Desktop services -> Remote Desktop Session Host -> Connections.
3. Restrict Remote Desktop Services user to a single remote....-> disable.
4. gpupdate
