I have currently implemented the below solution into our environment so that we can achieve pre-authorisation to access our RDWeb / HTML5 WebClient:
Whilst I can successfully log in and access published applications and the remote desktop within the browser itself fine, when I download the actual RDP file I get the following error when running it:
Your computer can't connect to the remote computer because authentication to the firewall failed due to missing firewall credentials. To resolve the issue, go to the firewall website that your network administrator recommends, and then try the connection again, or contact your network administrator for assitance.
I would be happy for users to use the browser, however they need Multi-monitor support and the browser version unfortunately does not have Multi-Monitor support.
Any assistance would be greatly appreciated.