Version: (using KDE 4.3.2) Installed from: I Don't Know I think a key configuration module missing from system settings is a module where you can configure your system's firewall. Linux has essentially built-in firewall support, as does windows and I assume mac does as well. But as far as I am aware there is no good, integrated way to configure it under KDE 4.
This feature request was originally submitted through KDE Brainstorm, and has been submitted to Bugzilla due to popular demand. Original idea: http://forum.kde.org/brainstorm.php?mode=idea&i=76124
*** This bug has been marked as a duplicate of bug 186356 ***