diff --git a/gns3server/server.py b/gns3server/server.py
index cc0e1f53..ba6d7650 100644
--- a/gns3server/server.py
+++ b/gns3server/server.py
@@ -99,6 +99,9 @@ class Server:
         if self._port_manager.udp_ports:
             log.warning("UDP ports are still used {}".format(self._port_manager.udp_ports))
 
+        for task in asyncio.Task.all_tasks():
+            task.cancel()
+
         self._loop.stop()
 
     def _signal_handling(self):