ModSecurity is a potent web application layer firewall for Apache web servers. It monitors the entire HTTP traffic to an Internet site without affecting its functionality and in case it detects an intrusion attempt, it blocks it. The firewall furthermore keeps a more detailed log for the traffic than any web server does, so you shall be able to monitor what is happening with your Internet sites a lot better than if you rely simply on conventional logs. ModSecurity employs security rules based on which it helps prevent attacks. For instance, it detects if someone is attempting to log in to the administration area of a particular script several times or if a request is sent to execute a file with a certain command. In such situations these attempts set off the corresponding rules and the firewall blocks the attempts instantly, and then records detailed details about them within its logs. ModSecurity is among the very best software firewalls available and it can protect your web applications against many threats and vulnerabilities, especially if you don’t update them or their plugins regularly.