Multisite subsite backend gives 404

Hey All – I have set up a multisite with subdomains today, which all seemed to be going well. The main site stayed online, and I could add an additional site, but then got a 404 on the front- and backend of the site.

For the frontend I then added the specific subdomain ‘retro’ in Plesk, since my hosting (hosting2go.nl) does not allow wilcards. Now it’s giving a generic Plesk page, informing me there is no index.html. (link)

The backend keeps giving a 404 error on retro.baotian-scooters.net/wp-admin/. Below the wp-config and htaccess. I hope someone can help, thanks already!

HTACCESS – from line 1

# BEGIN WordPress
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^(.*\.php)$ $1 [L]
RewriteRule . index.php [L]
# END WordPress

WP-CONFIG – from below the first 20 or so lines.

/* Multisite */
define('WP_ALLOW_MULTISITE', true);

define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', true);
define('DOMAIN_CURRENT_SITE', 'www.baotian-scooters.net');
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);
/* That's all, stop editing! Happy blogging. */

/** Absolute path to the WordPress directory. */
if ( !defined('ABSPATH') )
	define('ABSPATH', dirname(__FILE__) . '/');

define( 'SUNRISE', 'on' );

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');

(Sunrise is there, because I thought it could be a fix, but the subsite doesn’t work with or without, as the reader might have foreseen…)