diff --git a/gns3server/controller/compute.py b/gns3server/controller/compute.py
index 7aff7a83..1193e8d0 100644
--- a/gns3server/controller/compute.py
+++ b/gns3server/controller/compute.py
@@ -376,7 +376,7 @@ class Compute:
         """
         try:
             self._ws = yield from self._session().ws_connect(self._getUrl("/notifications/ws"), auth=self._auth)
-        except aiohttp.errors.WSServerHandshakeError:
+        except (aiohttp.errors.WSServerHandshakeError, aiohttp.errors.ClientResponseError):
             self._ws = None
         while self._ws is not None:
             try: