Port problems

[ecookman]

Alright, I have been having some trouble signing onto steam and MSN, SO i rand a diagnostic....Which revealed that I have closed ports. The ports are open on my router, and I can sign in from another computer on the same network.
SO, my question is, are there "internal ports" and can they be opened?

[andrew.]

Maybe you have some kind of firewall on your computer which is blocking certain ports?

[ecookman]

I looked in my firewall settings and it claims that the programs are using any ip/port adresses available..... so is there a way I can list the traffic on my computer? and then find which one is the problem one?