diff --git a/daemon/virtualizer.c b/daemon/virtualizer.c
index 39c24571..b9b50c95 100644
--- a/daemon/virtualizer.c
+++ b/daemon/virtualizer.c
@@ -887,9 +887,7 @@ static bool ports_connect_request(void * context, ladish_graph_handle graph_hand
     port2_id = ladish_port_get_jack_id_room(port2);
   }
 
-  graph_proxy_connect_ports(virtualizer_ptr->jack_graph_proxy, port1_id, port2_id);
-
-  return true;
+  return graph_proxy_connect_ports(virtualizer_ptr->jack_graph_proxy, port1_id, port2_id);
 }
 
 static bool ports_disconnect_request(void * context, ladish_graph_handle graph_handle, uint64_t connection_id)
@@ -920,9 +918,7 @@ static bool ports_disconnect_request(void * context, ladish_graph_handle graph_h
     port2_id = ladish_port_get_jack_id_room(port2);
   }
 
-  graph_proxy_disconnect_ports(virtualizer_ptr->jack_graph_proxy, port1_id, port2_id);
-
-  return true;
+  return graph_proxy_disconnect_ports(virtualizer_ptr->jack_graph_proxy, port1_id, port2_id);
 }
 
 static void ports_connected(void * context, uint64_t client1_id, uint64_t port1_id, uint64_t client2_id, uint64_t port2_id)
diff --git a/proxies/graph_proxy.c b/proxies/graph_proxy.c
index 6ff45097..75f17e7d 100644
--- a/proxies/graph_proxy.c
+++ b/proxies/graph_proxy.c
@@ -565,7 +565,7 @@ graph_proxy_detach(
   ASSERT(false);
 }
 
-void
+bool
 graph_proxy_connect_ports(
   graph_proxy_handle graph,
   uint64_t port1_id,
@@ -574,10 +574,13 @@ graph_proxy_connect_ports(
   if (!dbus_call(graph_ptr->service, graph_ptr->object, JACKDBUS_IFACE_PATCHBAY, "ConnectPortsByID", "tt", &port1_id, &port2_id, ""))
   {
     log_error("ConnectPortsByID() failed.");
+    return false;
   }
+
+  return true;
 }
 
-void
+bool
 graph_proxy_disconnect_ports(
   graph_proxy_handle graph,
   uint64_t port1_id,
@@ -586,7 +589,10 @@ graph_proxy_disconnect_ports(
   if (!dbus_call(graph_ptr->service, graph_ptr->object, JACKDBUS_IFACE_PATCHBAY, "DisconnectPortsByID", "tt", &port1_id, &port2_id, ""))
   {
     log_error("DisconnectPortsByID() failed.");
+    return false;
   }
+
+  return true;
 }
 
 static void on_client_appeared(void * graph, DBusMessage * message_ptr)
diff --git a/proxies/graph_proxy.h b/proxies/graph_proxy.h
index 45add1a9..d761f74b 100644
--- a/proxies/graph_proxy.h
+++ b/proxies/graph_proxy.h
@@ -75,13 +75,13 @@ graph_proxy_detach(
   graph_proxy_handle graph,
   void * context);
 
-void
+bool
 graph_proxy_connect_ports(
   graph_proxy_handle graph,
   uint64_t port1_id,
   uint64_t port2_id);
 
-void
+bool
 graph_proxy_disconnect_ports(
   graph_proxy_handle graph,
   uint64_t port1_id,