Enable Multiple RDP 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 Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Connections.
4.Set Restrict Remote Desktop Services user to a single Remote Desktop Services session to Disabled.
5.Double click Limit number of connections and set the RD Maximum Connections allowed to 999999.