Hi. We are in the process of testing the Multi-Factor Auth server and are currently using it for two-factor authentication to RDS for a couple of users. At the moment we are only using the phone call/text options but I'd like to get the mobile app portion working to test. Also still need to implement the user self-service portal for testing.
Currently I have a vm that was dedicated to MFA where the Multi-Factor Authentication Server software was installed. Now though I'm a bit confused as to if its safe to install the user portal and mobile app web service portion on this same machine or if they should go on a different server(s)? Currently the box is internal but I'm guessing if it has also act as the web server we would stick it behind the TMG for external inbound access. Is external access to the primary MFA server ok? What's the best practice for separation of the MFA roles; or is there none and its fine to just put it altogether?
Thanks.