ModSecurity is a powerful web app layer firewall for Apache web servers. It monitors the entire HTTP traffic to a site without affecting its overall performance and in case it discovers 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 an eye on what is going on with your websites much better than if you rely only on conventional logs. ModSecurity works with security rules based on which it helps prevent attacks. For example, it detects if somebody is attempting 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 certain command. In these circumstances these attempts trigger the corresponding rules and the firewall software blocks the attempts instantly, after that records comprehensive info about them in its logs. ModSecurity is one of the very best software firewalls available and it could easily protect your web applications against a huge number of threats and vulnerabilities, particularly in case you don’t update them or their plugins often.