How to specify a different port if the port 80 and 443 are already occupied?

Hi all!

I have a question! . I beg to apologize in advance for not very good english.

Let me describe an example.

I have two physical machines with installed one Windows Server 2012 and in the second set Windows Server Essentials there is also a router, both machines are directly connected to the router. Made on the router port forwarding on the first machine (Port 443 80 1723 3389 4125). The question the witness, what settings do I have reported on the router and on Windows Server Essentials that would have worked if the ports site 443 80 1723 3389 4125 already occupied the first car. Thank you in advance for your reply