ModSecurity is a highly effective web app layer firewall for Apache web servers. It monitors the entire HTTP traffic to a website without affecting its overall performance and in case it discovers an intrusion attempt, it blocks it. The firewall additionally maintains a more comprehensive log for the traffic than any web server does, so you'll manage to keep an eye on what is happening with your websites better than if you rely merely on standard logs. ModSecurity employs security rules based on which it helps prevent attacks. For instance, it identifies whether somebody is trying to log in to the administrator area of a particular script a number of times or if a request is sent to execute a file with a specific command. In such circumstances these attempts set off the corresponding rules and the software blocks the attempts immediately, after that records in-depth details about them within its logs. ModSecurity is among the best software firewalls on the market and it can protect your web applications against many threats and vulnerabilities, particularly if you don’t update them or their plugins regularly.