let's say that computer C1 is directly connected to the internet and shares the connection wth computer C2
C1 is under windows 2000, C2 is under redhat8.0 and everything works well until I decide to set an ssh or a web server on C2.
I changed the option of C1's shared connection so that it won't block port numbers 22 and 8080.
But that still doesnt work! =)
When I tell C1 to leave port 22 or 8080 alone he asks me for the incomings response port TCP and UDP, as I don't know what is is I didn't fill it at first and that didn't work ; then I filled it with the first thing that came in my mind and that still doesn't work. And I think my problem comes from here because the rest seems ok.

Can anyone help me? (please)

Just swap the roles of the boxes and you'll be fine :}

To use Windows for networking is like moving with a
wheel-barrow ...

If you insist on WinDOHs beenig a router go ask for
support on a winDOHs specific site ;)

Cheers,
Tink