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The Varnish VCL firewall is likely causing this issue. Check the response headers and the URL combination to determine the reason. Please send us the URL where the issue occurs and the rules, and we will check if this is a false positive that needs to be resolved. Example (see the block rule rules):

UPDATE `wp_options` SET `option_value` = 'a:0:{}' WHERE `option_name` = 'limit_login_lockouts'; Note: Ensure wp_ is the correct prefix; check the wp-config.php file for the prefix. Also see: Enabling Reverse Proxy

Empty your upload_path as described in this article. Use this define in the wp-config file: define('UPLOADS', 'wp-content/uploads');

Enable XMLRPC Review the .htaccess file and if there are blocking rules, remove them or comment them out by adding a hash (#) in front of them. Add the following line to wp-config.php: define('MP_NO_DISALLOW_XMLRPC', true);

Read how to filter the $is_dismissed boolean here: https://github.com/managedwphosting/developers/blob/master/examples/notices.php