ModSecurity is a highly effective firewall for Apache web servers that's employed to stop attacks against web applications. It tracks the HTTP traffic to a given site in real time and prevents any intrusion attempts the instant it identifies them. The firewall uses a set of rules to do this - as an illustration, attempting to log in to a script administration area without success many times triggers one rule, sending a request to execute a certain file that may result in accessing the website triggers another rule, and so forth. ModSecurity is amongst the best firewalls on the market and it will secure even scripts which aren't updated often as it can prevent attackers from employing known exploits and security holes. Very comprehensive information about every single intrusion attempt is recorded and the logs the firewall keeps are a lot more comprehensive than the standard logs created by the Apache server, so you may later examine them and decide whether you need to take more measures in order to increase the protection of your script-driven Internet sites.