It looks like the ADA probe also requires access to http on port 80 just like NFA does.
ada_inventory AC Configuration - CA Unified Infrastructure Management Probes - CA Technologies Documentation
However, as with NFA you can configure IIS to use both http/port 80 and https/port 443, in IIS bindings.
Then you can have the Single Sign On settings, which controls the login page, set to only use HTTPS so the login page will require https, on port 8382, but other pages can load in either http or https. However if a user logs in with https the broswer will stay in https unless someone manually changes it to http.
This would allow NFA and ADA to allow connections from the UIM ada_inventory and nfa_inventory probes over port 80, but force users to login to nfa/ada with https.