Hosts and virtual machines in a VMware Horizon deployment must meet specific hardware and operating system requirements. Compatibility Matrix for Various Versions of VMware Horizon ComponentsBecause large enterprises must often perform phased upgrades, components are designed to be somewhat forward and backward compatible during upgrades. Horizon Connection Server RequirementsHorizon Connection Server acts as a broker for client connections by authenticating and then directing incoming user requests to the appropriate remote desktops and applications. Horizon Connection Server has specific hardware, operating system, installation, and supporting software requirements. Requirements and Considerations for Horizon AgentThe Horizon Agent component assists with session management, single sign-on, device redirection, and other features. You must install Horizon Agent on all virtual machines, physical systems, and RDS hosts.