How to fix cPanel FTP passive mode error?

Website builder requires FTP passive mode enabled on your server to be able to publish websites. Please refer official documentation by cPanel to enable FTP passive mode on cPanel.

Also, please note, that cPanel may block connections coming from website builder due incompatibility issues. Try to enable "Broken Clients Compatibility" option in FTP configuration within WHM system. Please check if firewall doesn't block passive FTP ports when using together with SSL.