Newer Windows version clients (Windows 10) will not connect to the gateway and I get "The logon attempt failed"
Only when I set this registry key HKCU\Software\Microsoft\Terminal Server Client\RDGClientTransport to "1" on the client, it will connect.
When I do this it will connect using RPC-HTTP and in the Admin log of TerminalServices-Gateway it will say:
"The RD Gateway client supports HTTP proxy protocol but connected using Legacy RPC-HTTP."
On the firewall of the gateway, I have enabled all options for Remote Desktop for all profiles.
Remote Desktop - Shadow (TCP-In)
Remote Desktop - User Mode (TCP-In)
Remote Desktop - User Mode (UDP-In)
Remote Desktop Gateway Server Farm (RPC HTTP Load Balancing Service)
Remote Desktop Gateway Server Farm (RPC-EPMAP)
Remote Desktop Gateway Server Farm (TCP-In)
Remote Desktop Gateway HTTP Listener
Remote Desktop Gateway UDP Listener
What else could it be?