ModSecurity is a highly effective web app layer firewall for Apache web servers. It monitors the entire HTTP traffic to a site without affecting its performance and if it discovers an intrusion attempt, it blocks it. The firewall also maintains a more comprehensive log for the site visitors than any web server does, so you shall be able to monitor what is going on with your sites a lot better than if you rely simply on standard logs. ModSecurity employs security rules based on which it helps prevent attacks. For instance, it identifies whether somebody is trying to log in to the administration area of a certain script a number of times or if a request is sent to execute a file with a particular command. In these circumstances these attempts set off the corresponding rules and the firewall program blocks the attempts immediately, then records in-depth information about them within its logs. ModSecurity is one of the most effective software firewalls available and it can protect your web applications against a huge number of threats and vulnerabilities, particularly in case you don’t update them or their plugins often.