I recently bought a domain, mainly for website experimentation, game servers and a ventrillo server. I'm running all this from my home computer, and I am using freedns.afraid.org as my dns nameserver. I'm able to host my ventrillo and my game server, however you can access either of them from any of my subdomains. I would like specific programs to only work with specific ports, but I can't seem to find a way to make this happen. So in my Ventrillo subdomain, I try putting in the IP address in the destination as "MyIPAddress:PortNumber" , but it says its an invalid IP address. The ddns client I use doesn't have any options to change the ports on the connections either. Am I just missing something here, or is there no way to tie specific server applications to specific ports with a subdomain?
I also am curious as to how hosting this domain will affect my pc security. I'm running this on a Windows 7 pc. I know its best to have a stand alone computer for this stuff, but like I said its only experimental and I don't plan on running these more than a couple hours a day, if that. Are there any steps I need to take to increase my security, beyond basic Windows security measures?