I'm redirecting and nothing's fixing it!

I recently switched a single-install to multi-site. Followed all the instructions, moved to another folder, activated multi-site. No problems!

Until I try to get to the network admin. Then I get a redirect loop. The wp-admin/ works just fine. wp-admin/network/ is forever redirected.

All my permalinks are working and redirecting properly, too.

I’ve tried everything short of hacking away at the the core.

From wp-config

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

define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', true);
define('DOMAIN_CURRENT_SITE', 'domain.com');
define('PATH_CURRENT_SITE', '/mu/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

From .htaccess

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).*) mu/$1 [L]
RewriteRule ^(.*\.php)$ mu/$1 [L]
RewriteRule . index.php [L]