Ticket #17168: 17168.2.diff

src/wp-admin/network/admin.php

@@ -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 = ( ( strtolower( $current_blog->domain ) != strtolower( $current_site->domain ) ) || ( $current_blog->path != $current_site->path ) );
 /**
  * Filter whether to redirect the request to the Network Admin.
  *