I will assume that you already have TFS setup and are just using HTTP and want to make things a bit more secure with HTTPS. I am also assuming that you will be using port 443 for HTTPS traffic.
To update TFS to use HTTPS you need to do a couple of things:
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Have a legitimate certificate installed on the server that you can bind to
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Have an IP address on the server and have firewall access setup to that IP address on port 443
But there are a few more steps as well, so click through to see them all.