ModSecurity is a powerful web application layer firewall for Apache web servers. It monitors the whole HTTP traffic to a website without affecting its performance and in case it discovers an intrusion attempt, it prevents it. The firewall additionally keeps a more comprehensive log for the website visitors than any web server does, so you will be able to keep track of what is happening with your Internet sites much better than if you rely only on conventional logs. ModSecurity works with security rules based on which it stops attacks. For example, it identifies whether someone is attempting to log in to the administrator area of a given script multiple times or if a request is sent to execute a file with a particular command. In such circumstances these attempts trigger the corresponding rules and the firewall software blocks the attempts immediately, and then records comprehensive details about them inside its logs. ModSecurity is among the very best software firewalls on the market and it can easily protect your web apps against a huge number of threats and vulnerabilities, particularly if you don’t update them or their plugins often.