I have a situation where I'm trying to publish an RDS Server (2012 R2) that sits on premise with Azure App Proxy. All RDS roles are installed on this one box and I've configured the Azure App Proxy app to use the following:
Preauthentication Method: Azure Active Directory
Internal Authentication Method: Integrated Windows Authentication
Internal Application SPN: HOST/servername.domain.name.com
*with "servicename.domain.name.com" = the internal FQDN of the server.
Delegated Login Identity = User Principal Name
We have ADFS and Proxy in place for authentication and have published other on premise apps with this method. The issue I'm seeing is that I'm able to authenticate to the /RDWEB virtual directory and see my RemoteApps, however, when I launch one it tells me the RDGateway is unavailable. Do I need to configure a Relying Party Trust in ADFS?