I have a Server 2012 R2 (Datacenter edition) RDS server.. serving remote apps...... I am still experiencing the same issue on a Windows 10 and Windows 7 clients.
I *can* connect via the web or via the control panel, but if I right click the icon in the system tray and say "reconnect" it generates the endpoint errors. I can duplicate it every time.
Can someone please help? This is the only thread my Google-Fu lead me to, that is even close to matching my problem.