ModSecurity is a module which protects your website from various types of attacks. Mod Security protects our website from hackers, attacks, a brute force attack, a cross-site request forgery(CSRF) and many other threats. Although it sometimes creates a problem, we do not recommend you to disable it but instead fix your software vulnerability. The reason for this is that ModSecurity only blocks your website if your
software security is bad.
How to Enable or Disable Mod Security in DirectAdmin
After loggin into the user's DA control panel , from the dashboard look for Modecurity
Click there and select Off. When you have finished making changes to your site, it can be re-enabled