Error : Cookies are blocked or not supported by your browser

Cookies are enabled per default. By setting

define('ADMIN_COOKIE_PATH', "https://wordpress.stackexchange.com/");
define('COOKIE_DOMAIN', '');
define('COOKIEPATH', '');
define('SITECOOKIEPATH', '');

you just disabled them by setting the path to an empty string. The ADMIN_COOKIE_PATH per default is the SITECOOKIEPATH followed by wp-admin and the SITECOOKIEPATH is extracted from get_current_site()->path. See source. Just revert what you did and delete the constants from your wp-config.php.

Your actual problem seems that your browser has cookies disabled. Better fix that 🙂

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