I use cloudflare level dns server, but this is not the problem.
Can i did solve this Disabling ModSecurity on Cpanel:
Step 3: Disable ModSecurity / suPHP
The correct configuration of ModSecurity or suPHP with Revive Adserver will depend very much on your requirements. If you're finding that Revive Adserver is "broken", first try turning off ModSecurity/suPHP completely, and see if that fixes the issue. If so, you know what the issue is, and can look to update your configuration to meet your needs, while still allowing Revive Adserver to work.
After disable this, my cloudflare show 501 error, and redirect with the new advertiser included.