It is indeed, unsupported, there was an procedure floating around to get it working, but it was untested by development/QA and we found other intermittent problems with connecting to NFA. So I'd recommend switching the RIB service back to its default HTTP settings.
As for using HTTPS for the NFA data source for drilling down to the NFA web page you go to "Admin->Data Sources" and edit the NFA Data source.
Uncheck the box that says "Same as Data Source".
And under the "Web Console" section set it to use HTTPS and port 443.
For The top section "Data Source" set it to HTTP and port 80 like below: