[Luke Skyfreeper]

Get yourself a firewall, either an external 'router' type firewally like something from Netgear or Linksys, or a software firewall like ZoneAlarm.

I'm running a software firewall; but how do you check / manipulate blocking on an individual port?

[Dimensio]

Port blocking varies from package to package, so you should check the documentation for the software that you use.