I feel very shameful to admit that, for past several months, I left my server being wide open. She didn't receive any protection from any local firewall. Of course, the IT depts. of my university and my faculty have done great jobs in implementing the firewall. These protect me from outside threat but my server still sit idly feeling clueless of any person who has a chance to plug into university network. That's why I was trying to enable firewall on my server.
Just tried the new Fedora 10 on my PC. The problem is that I want to export all my NTFS drives on F10 via Samba, so that any machine can still access my file even though I am not on Windows. NTFS-3G works quite well and setting up Samba is no longer a problem. Of course, firewall must be adjusted to allow samba protocol. Firestarter is a nice application for the simple thing such as allowing a specific port, a feat that actually requires several rules in iptables config to efficiently permit the protocol.
Quick words, I am having problem with the Win Key in Linux; Cannot use it with other key combination to make a keyboard short cut. For example, I wish to open Konqueror by pressing Win+E (just to resemble openning windows explorer) but KDE won't accept it. When I press Win+E, KDE recognized it as just "E".
Googling around and the solution is simply to put this option in
/etc/X11/xorg.conf in the InputDevice Section