diff --git a/src/adapter/adapter.c b/src/adapter/adapter.c
index 3b5f6c33..b8d01607 100644
--- a/src/adapter/adapter.c
+++ b/src/adapter/adapter.c
@@ -911,7 +911,10 @@ static int adapter_loop(enum neu_event_io_type type, int fd, void *usr_data)
             error.error = neu_adapter_driver_del_group(
                 (neu_adapter_driver_t *) adapter, cmd->group);
         } else {
-            error.error = NEU_ERR_GROUP_NOT_ALLOW;
+            adapter->module->intf_funs->request(
+                adapter->plugin, (neu_reqresp_head_t *) header, &header[1]);
+            neu_msg_free(msg);
+            break;
         }
 
         if (error.error == NEU_ERR_SUCCESS) {
diff --git a/src/core/manager.c b/src/core/manager.c
index 573eb06b..581c148d 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -1098,9 +1098,24 @@ static int manager_loop(enum neu_event_io_type type, int fd, void *usr_data)
             neu_msg_exchange(header);
             reply(manager, header, &e);
         } else {
+            UT_array *apps = neu_subscribe_manager_find(
+                manager->subscribe_manager, cmd->driver, cmd->group);
+
             forward_msg(manager, header, header->receiver);
             neu_subscribe_manager_remove(manager->subscribe_manager,
                                          cmd->driver, cmd->group);
+
+            if (NULL == apps) {
+                break;
+            }
+
+            // notify app node about group deletion
+            utarray_foreach(apps, neu_app_subscribe_t *, app)
+            {
+                forward_msg_copy(manager, header, app->app_name);
+            }
+
+            utarray_free(apps);
         }
         break;
     }