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https://blog.it-kb.ru/2013/09/09/remote-desktop-services-rds-in-farm-high-availability-rd-connection-broker-on-windows-server-2012-with-shared-database-rdcb-works-only-on-first-three-servers/
High Availability RD Connection Broker на базе Windows Server 2012–выявленная закономерность в конфигурации с более чем 3 серверами