ModSecurity is a URL firewall and it triggers based on a set of regular expressions (pattern matches). ModSecurity protects websites and web applications from hackers and malware by filtering and monitoring HTTP traffic between a web app and the Internet.
cPanel has this feature by default and uses the OWASP ModSecurity Core Rule Set, created by atomicorp.com.
Some website changes you attempt to make could trigger one (or more) of the rules often resulting in 403 Forbidden errors, 404 errors or causing your IP address to get blocked by the server.
What can I do if I am getting blocked?
If you are getting blocked by ModSecurity, please visit this article.
If you have any questions on the above, please do not hesitate to 'Open a Ticket' and we will be happy to advise further.
