If you are seeing “ERROR: Cookies are blocked or not supported by your browser. You must enable cookies to use WordPress.” WordPress login page, chances are you either changed the content of your wp-content folder through FTP or you activated some plugins that crashed your WordPress.
Worry not, though.
Simply add the following code snippets to your wp-config.php before “/* That’s all, stop editing! Happy publishing. */”
define('ADMIN_COOKIE_PATH', '/'); define('COOKIE_DOMAIN', ''); define('COOKIEPATH', ''); define('SITECOOKIEPATH', '');
and save your file.
Now, you should be able to log into dashboard.