On Windows server 2008/2008 R2, if you want multiple remote users to access the server's Remote Desktop (RDP) using the same account at the same time, simply set it up by using Remote Desktop Session Host configuration under Administrative Tools-Remote Desktop. or by command: Enter "Tsconfig" in the run to see the following prompt: Each user will be allowed to set a session to "no".
However, under Windows Server 2012, the system does not provide this configuration tool by default (it can be added manually by adding roles and features). Therefore, if you want to cancel Windows Server Edition RDP by restricting each user to only one session, you can use the Group Policy Editor to resolve it entirely.
Run Gpedit.msc first, find Computer Configuration-Administrative Templates-Windows components-Remote Desktop Services-Remote Desktop Session Host-connections-restrict Remote Desktop Services users to a separate Remote Desktop Services session disable this option, and finally execute Gpupdate/force can be.
How to cancel Windows Server R2 RDP limit per user to only one session (GO)