Hi, I have upgraded my lab to latest xena release and ovn 21.09 and ovs 2.16. I am trying to create stateless security group. But its getting failed with below error message. # openstack security group create --stateless sec02-stateless Error while executing command: BadRequestException: 400, Unrecognized attribute(s) 'stateful' I see below logs in neutron server logs. 2021-11-02 12:47:41.921 1346 DEBUG neutron.wsgi [-] (1346) accepted ('172.16.40.45', 41272) server /usr/lib/python3/dist-packages/eventlet/wsgi.py:992 2021-11-02 12:47:42.166 1346 DEBUG neutron.api.v2.base [req-b6a37fff-090f-4754-9df7-6e4314ed9481 19844bf62a7b498eb443508ef150e9b8 98687873a146418eaeeb54a01693669f - default default] Request body: {'security_group': {'name': 'sec02-stateless', 'stateful': False, 'description': 'sec02-stateless'}} prepare_request_body /usr/lib/python3/dist-packages/neutron/api/v2/base.py:729 2021-11-02 12:47:42.167 1346 WARNING neutron.api.v2.base [req-b6a37fff-090f-4754-9df7-6e4314ed9481 19844bf62a7b498eb443508ef150e9b8 98687873a146418eaeeb54a01693669f - default default] An exception happened while processing the request body. The exception message is [Unrecognized attribute(s) 'stateful'].: webob.exc.HTTPBadRequest: Unrecognized attribute(s) 'stateful' 2021-11-02 12:47:42.167 1346 INFO neutron.api.v2.resource [req-b6a37fff-090f-4754-9df7-6e4314ed9481 19844bf62a7b498eb443508ef150e9b8 98687873a146418eaeeb54a01693669f - default default] create failed (client error): Unrecognized attribute(s) 'stateful' 2021-11-02 12:47:42.168 1346 INFO neutron.wsgi [req-b6a37fff-090f-4754-9df7-6e4314ed9481 19844bf62a7b498eb443508ef150e9b8 98687873a146418eaeeb54a01693669f - default default] 172.16.40.45 "POST /v2.0/security-groups HTTP/1.1" status: 400 len: 317 time: 0.2455938 Any advice on how to fix it ? Ammad