


On the right, double-click on the “ Restrict Remote Desktop Services users to a single Remote Desktop Services session” policy. In the left pane, navigate to: Computer Configuration -> Administrative Templates -> Windows Components -> Remote Desktop Services -> Remote Desktop Session Host -> Connections.


“The number of connections to this computer is limited and all connections are in use right now. When the limit is reached, you should get one of the following warnings: RDP is the protocol and the term "Remote Desktop Connection" is typically used to describe the generic Remote Desktop Connections that administrators would typically use to work on a server directly.By default, Windows Server allows only a single Remote Desktop session. The term "RDS" refers to a larger suite of products that implements virtual desktops and RemoteApp. *(I edited this to clear up some of the confusion. It's a terrible hack that will probably break every time Windows applies patches, or it might be the opposite scenario where the hack will break certain Windows patches. TS Gateway and RDS Session Hosts shouldn't be included on a domain controller, but you can potentially get some of the services to work on a domain controller. To do so, you will need a multi-server infrastructure of at least two machines to host the various RDS roles as well as at least one domain controller. RDS can allow for a number of simultaneous connections that is only limited by your bandwidth and server hardware. If you need more remote connections you need to research RDS which requires it's own set of user connection licenses in addition to CALs. Windows by default allows two RDS RDP* connections out of the box, and they are known as "administrative connections" regardless of if the user account is an administrator or not.
