When configuring an anonymous FTP server, it is extremely important to ensure that all security precautions are taken to prevent malicious users from gaining privileged-level access to the server. Although this chapter shows you how to configure your FTP server for secure use, all machines connected to the Internet are potential targets for malicious attacks. Vulnerable systems can be a source of potential liability, especially if anyone accesses and uses them to store illegal copies of proprietary software — even temporarily. There is little value in configuring a secure FTP server if the rest of the system is still vulnerable to attack. Use Red Hat's lokkit or system-config-securitylevel client to implement a firewall on your system.