+ /**
+ * Fires when a network cannot be found based on the requested domain and path.
+ *
+ * At the time of this action, the only recourse is to redirect somewhere
+ * and exit. If you want to declare a particular network, do so earlier.
+ *
+ * @since 4.4.0
+ *
+ * @param string $domain The domain used to search for a network.
+ * @param string $path The path used to search for a path.
+ */
+ do_action( 'ms_network_not_found', $domain, $path );
+
+ ms_not_installed( $domain, $path );