change the port MF is using if you have IIS installed on the same server that listens on 443. Mine is running on 4433 so link would be https://servername:4433. Since it is an internal website MDS will not have problem resolving name for you (so you don't need to open MF from the outside to access MF using BB. Only if you want to manage using your mobile or external com with no VPN.
btw dc/dc I did not even know you can install MF on IIS??