We have an RDP gateway which is an awful pile of shit to deal with as it uses HTTPS initiated MSRPC as the transport layer. FreeRDP doesn't work properly with that yet as there are all sorts of odd configuration and encryption things that are almost impossible to line up properly when your ops team don't actually know what they're doing or how to find out stuff for you.
Ugh; I remember having that problem a couple of years ago. In the end I had to split a room of thin clients in half, and have them each point at 1 of 2 hosts. Defeating the point of load balancing entirely :/
