diff --git a/milvus_client.py b/milvus_client.py
index 47034b7..f9a3794 100644
--- a/milvus_client.py
+++ b/milvus_client.py
@@ -50,6 +50,8 @@ class MilvusClient(PyOperator):
             raise ConnectionError('Received invalid connection arguments.')
 
         if any(x is None for x in [token, user, password]):
+            self._connection_args['secure'] = False
+        else:
             self._connection_args['secure'] = True
 
         connections.connect(**self._connection_args)