Hello,
I'm using CentOS and installed ModSecurity with below command:
# yum install mod_security mod_security_crs
After it, edited "/etc/httpd/conf.d/mod_security.conf" file and changed "SecRuleEngine DetectionOnly" to "SecRuleEngine On" and restarted Apache service.
Any header or configuration line must be added to the "httpd.conf" file?
Thank you.