2.4 Assumptions and Preconditions
The Remote Desktop Services protocols assume that:
The RDP client and RD Session Host server have network connectivity over TCP/IPv4 or IPV6, as specified in [RFC793] and [RFC2460].
The RDP client initiating the connection is using an implementation of the Remote Desktop Protocol (RDP).
The RD Session Host server is configured, and any firewall between the RDP client and RD Session Host server is configured to allow RDP traffic.
The RD Session Host server is actively listening for RDP client connections on a registered port.