Various things and scripts which make an Admin's life easier. Use the stuff wisely. You are responsible for your own administration.
Two simple scripts to implement a firewall.
You can download them here. The file "fw-desktop" protects your notebook or workstation. The file "fw-server" is a little bit more tricky and protects your server. Please read the script thoroughly and make yourself aware what it does. Otherwise your server is unreachable. One thing you have to check is the SSH port for sure.