ModSecurity is a potent web application layer firewall for Apache web servers. It monitors the whole HTTP traffic to an Internet site without affecting its operation and when it discovers an intrusion attempt, it blocks it. The firewall furthermore maintains a more comprehensive log for the traffic than any web server does, so you shall be able to keep track of what is going on with your sites better than if you rely merely on conventional logs. ModSecurity works with security rules based on which it helps prevent attacks. For instance, it recognizes whether somebody is attempting to log in to the admin area of a given script several times or if a request is sent to execute a file with a particular command. In these cases these attempts trigger the corresponding rules and the firewall software hinders the attempts in real time, after that records in-depth information about them within its logs. ModSecurity is amongst the most effective software firewalls available and it can protect your web applications against thousands of threats and vulnerabilities, particularly if you don’t update them or their plugins frequently.