Cannot connect to Jetpack. [site_inaccessible] [HTTP 406] errors

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My website is ************.com

I get this message when I tried to activate Jetpack.

Your website needs to be publicly accessible to use Jetpack: site_inaccessible
Error Details: The Jetpack server was unable to communicate with your site [HTTP 406]. Ask your web host if they allow connections from If you need further assistance, contact Jetpack Support:

I have already disabled all the plugins and reinstall wordpress at the dashboard. But the error is still there.
Hello, Thank you for contacting us about a site_inaccessible] [HTTP 406] error today. This is a possible block by mod_security. Try disabling mod_sec from cPanel, then testing your site. If your problems persist, contact Live Support so they can review the log for specific errors. If you have any further questions, feel free to post them below. Best Regards, John-Paul