help

ok i need some help, for the last few weeks i have been trying to use steam but it starts updateing and crashes, i have looked on the website and it says to do a heap of things and i have done/am doing all but one.
for some reason my username and password wont work and let me into my modem settings to open the ports needed (if i need to open them)
my question is, is there a way to find a list of the ports you have without needed to log into anything?

Try a games forum.