I didn't say Cloudflare is blocking. My hosting company is blocking. because they setup the PHP-FPM max_children Setting for less. so only current visitors can enter to my website. after I setup the Cloudflare, then I found out.
"My hosting company is blocking. because they setup the PHP-FPM max_children Setting for less"
That would not block visitors from viewing your site; not having proper settings may slow your site. Are you on a VPS or Dedicated server?