DFind is the vulnerability scanner generating the "w00tw00t.at.ISC.SANS.DFind" HTTP requests found in Web servers logs. This guide setup some iptables rules blocking these requests. A better method is to use fail2ban to block the sources of these requests.
This post describe a simple way to block all access to a network port on Debian, except for specified IP addresses.
PeerGuardian is a firewall for Peer to Peer software (i.e. BitTorrent) blocking bad peers.
sf-downloader is a script created to ease the download of software's latest versions (from sourceforge.net initially). It find the correct download link for the software, and then download it and, if needed, extract it. This guide describe its installation on Debian.
After a hardware change (either network interface or motherboard), the network interfaces can be missing. This guide describe how to fix this issue.