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 performance and in case it identifies an intrusion attempt, it blocks it. The firewall furthermore maintains a more detailed log for the traffic than any server does, so you'll be able to keep track of what is happening with your Internet sites much better than if you rely simply on conventional logs. ModSecurity employs security rules based on which it helps prevent attacks. For example, it recognizes whether anyone is trying to log in to the administrator area of a certain script multiple times or if a request is sent to execute a file with a specific command. In such circumstances these attempts trigger the corresponding rules and the firewall hinders the attempts in real time, then records detailed info about them in its logs. ModSecurity is amongst the very best software firewalls available and it can easily protect your web apps against many threats and vulnerabilities, particularly in case you don’t update them or their plugins often.