ModSecurity is a potent web application layer firewall for Apache web servers. It monitors the whole HTTP traffic to a website without affecting its functionality and when it identifies an intrusion attempt, it prevents it. The firewall furthermore keeps a more comprehensive log for the website visitors than any web server does, so you will be able to keep track of what's happening with your Internet sites much better than if you rely only on conventional logs. ModSecurity employs security rules based on which it prevents attacks. For instance, it identifies if someone is attempting to log in to the admin area of a certain script several times or if a request is sent to execute a file with a certain command. In such circumstances these attempts set off the corresponding rules and the software blocks the attempts in real time, after that records detailed information about them inside its logs. ModSecurity is among the very best software firewalls available and it can protect your web apps against thousands of threats and vulnerabilities, especially in case you don’t update them or their plugins frequently.