I want to limit connections number per ip on specific port. Should I use some firewall or anything else?
P.S. Port doesn't have to be port 80, or 3389. It can be any port
Although its possible for more advanced firewalls to limit the number of simultaneous connections per port, this setting is usually a function of whatever server is listening on that port. The basic Windows firewall doesn't allow this. You might get a more specific answer if you specify what server program's connections you're trying to limit.