ModSecurity is a highly effective web app layer firewall for Apache web servers. It monitors the whole HTTP traffic to a site without affecting its functionality and if it identifies an intrusion attempt, it blocks it. The firewall furthermore maintains a more thorough log for the traffic than any web server does, so you'll be able to keep an eye on what's happening with your Internet sites a lot better than if you rely merely on standard 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 admin area of a specific script a number of times or if a request is sent to execute a file with a specific command. In such cases these attempts set off the corresponding rules and the firewall software hinders the attempts in real time, then records in-depth information about them inside its logs. ModSecurity is one of the most effective software firewalls available and it can protect your web apps against many threats and vulnerabilities, especially in case you don’t update them or their plugins regularly.