ModSecurity is a highly effective web application layer firewall for Apache web servers. It monitors the entire HTTP traffic to a website without affecting its performance and in case it identifies an intrusion attempt, it prevents it. The firewall additionally maintains a more detailed log for the traffic than any server does, so you shall manage to keep an eye on what is going on with your sites better than if you rely simply on conventional logs. ModSecurity employs security rules based on which it stops attacks. For example, it identifies whether someone is trying to log in to the administration area of a given script several times or if a request is sent to execute a file with a particular command. In such situations these attempts trigger the corresponding rules and the firewall blocks the attempts immediately, then records detailed details about them within its logs. ModSecurity is among the very best software firewalls out there and it can easily protect your web applications against thousands of threats and vulnerabilities, particularly if you don’t update them or their plugins often.