Our software runs on 443 (https) on IIS and our network administrator insist on closing port 80 on the firewall. Port 80 would be used to redirect to 443.
The problem is that the users now need to type "https://" specifically in the browser to access the site (which they don't). Without port 80 it isn't possible to redirect to 443.
So, does closing port 80 make the server more secure?