Prevent web application access using real IP address FortiWeb

Hello everyone,

hoping all is well with you , I am using FortiWeb to protect about 10 web servers on my network , I am using subdomain from my domain from Godaddy like ( abc.xyz.com ) and assign NATed real IP to the subdomain so users can use this subdomain to access the web applications that protected by FortiWeb, but if a user use the real IP the web application works fine but I need to prevent using Real IP I need block this , I need users to use only my subdomains , because there are many Bot scanners try to attack my web applications and using Real IP at the column ( HTTP Host )