https://support.managed.com/kb/a1816/how-to-enable-disable-multiple-rdp-sessions-in-windows-2012.aspx

By default, Windows 2012 servers allow a single Remote Desktop session. If only one session is available and you take over another person's live session, you may choose to enable multiple RDP sessions. This article describes the process for enabling and disabling multiple sessions.

1. Log into the server using Remote Desktop.
2. Open the start screen (press the Windows key) and type gpedit.msc and open it
3. Go to <fc #ff0000>→Computer Configuration → Administrative Templates → Windows Components → Remote Desktop Services → Remote Desktop Session Host → Connections.</fc>
4. Set <fc #6495ed>Restrict Remote Desktop Services user to a single Remote Desktop Services session</fc> to Disabled.
5. Double click <fc #4682b4>Limit number of connections</fc> and set the <fc #4682b4>RD Maximum Connections allowed</fc> to 999999.

1. Log into the server using Remote Desktop.
2. Open the start menu and type gpedit.msc and open it
3. Go to <fc #ff0000>Computer Configuration → Administrative Templates → Windows Components → Remote Desktop Services → Remote Desktop Session Host → Connections.</fc>
4. Set <fc #6495ed>Restrict Remote Desktop Services user to a single Remote Desktop Services session</fc> to Enabled.

Check remote connections with qwinsta !! Delete remote connections with rwinsta !!