It might be possible but running anything other than FMS on a server is not advisable.
Try setting up two virtual boxes, one for IIS and one for FMS.
Thanks for the reply. I'd like to know why it would not be advisable. I'm setting up a high-powered machine with more than enough RAM (2156), with 11 hot-swappable 15K drives, etc for a company that is going to use FM Server to serve maybe 4 simultaneous users maximum via the web interface, and also wants to use the machine as an internal intranet we server for about 100 people with probably at most a handful of simultaneous users.
What do you want to work on 80 ?
You can put static HTML on FM web site, on same port. Or you can run any PHP in FM web site.
I installed FMS14 with default settings, it use 80/443/16000 for the site. Then I re-enabled "Default Web Site" that disabled in installation, using 8080 and installed some CGI in it. Both worked well.
But this is only poor man's test, there was very few access.
I don't have any experience on changing FM site port, but it is supported.