ModSecurity is a powerful web app layer firewall for Apache web servers. It monitors the entire HTTP traffic to an Internet site without affecting its functionality and in case it detects an intrusion attempt, it prevents it. The firewall additionally keeps a more comprehensive log for the site visitors than any server does, so you shall be able to keep an eye on what is happening with your websites a lot better than if you rely only on conventional logs. ModSecurity employs security rules based on which it stops attacks. For instance, it recognizes if anyone is attempting to log in to the admin area of a given script a number of times or if a request is sent to execute a file with a specific command. In such instances these attempts set off the corresponding rules and the firewall hinders the attempts immediately, then records in-depth information about them in its logs. ModSecurity is among the best software firewalls on the market and it can protect your web applications against many threats and vulnerabilities, especially in case you don’t update them or their plugins frequently.