Assessing risk and making prudent decisions before the system is installed is the best approach. You can go a long way towards providing good security by establishing a security policy. A security policy is a written document that outlines what is permitted behavior on the system. Once written, it is reviewed periodically and distributed to all users of the system. No system can be fully secure, but with due diligence and attention to detail, many security threats can be mitigated.
Linux is not susceptible to viruses in the strictest sense of the word (no pun intended), but permitting content to enter the system that has not explicitly been authorized will surely lead to problems.
Guardian Digital's EnGarde Secure Professional has been engineered with the greatest degree of security available on any Linux Open Source e-business server to date. No longer is it the case that a company can purchase or contract an e-commerce solution without great concern for the assurance and integrity for the data and information contained within it. Guardian Digital solutions have been engineered with security as a primary concern, providing that high degree of assurance required to conduct business on the Web today.
This high level of security integrated in to EnGarde Secure Professional requires you follow the guidelines in this manual when configuring and administering EnGarde. By following these guidelines you can be assured the highest level of system security at all times.