diff -r 346c88efed21 -r 5e2f62d02dcd wp/wp-admin/network/admin.php
--- a/wp/wp-admin/network/admin.php	Mon Jun 08 16:11:51 2015 +0000
+++ b/wp/wp-admin/network/admin.php	Tue Jun 09 03:35:32 2015 +0200
@@ -15,7 +15,15 @@
 if ( ! is_multisite() )
 	wp_die( __( 'Multisite support is not enabled.' ) );
 
-$redirect_network_admin_request = ( ( $current_blog->domain != $current_site->domain ) || ( $current_blog->path != $current_site->path ) );
+$redirect_network_admin_request = 0 !== strcasecmp( $current_blog->domain, $current_site->domain ) || 0 !== strcasecmp( $current_blog->path, $current_site->path );
+
+/**
+ * Filter whether to redirect the request to the Network Admin.
+ *
+ * @since 3.2.0
+ *
+ * @param bool $redirect_network_admin_request Whether the request should be redirected.
+ */
 $redirect_network_admin_request = apply_filters( 'redirect_network_admin_request', $redirect_network_admin_request );
 if ( $redirect_network_admin_request ) {
 	wp_redirect( network_admin_url() );