when considering fault tolerance/HA requirements for a remote desktop gateway system, which of the various components of the systems architecture need consideration from a failover perspective to support high availability requirements. How does your RDG design look to factor in the various risk scenarios to support high availability?
Remote AccessWindows 10Windows Server 2016Windows OSWindows Networking
In addition to the two remote desktop gateway servers and the two load balancers. To establish greater security you can deploy and configure two NPS (Network Policies Server) servers and have centralized administration and control access to the network through policies.
I indicate a link with more detailed information about an NPS server.
Annex ports and protocols that you must have allowed to avoid communication problems, during the initial configuration.