Hi Qihang: What type of setup you deployed ? AIO-Simplex , Bare-metal or VM ? and what starlingx version? There are 2 related LP for your reference . As mentioned [1], only found this issue in AIO-Simplex/VM env. [1] https://bugs.launchpad.net/starlingx/+bug/1882172 [2] https://bugs.launchpad.net/starlingx/+bug/1880777 Thanks. BR Austin Sun. From: 北邮_通信工程_刘启航 <lqihang@163.com> Sent: Friday, October 8, 2021 7:45 PM To: starlingx-discuss@lists.starlingx.io Subject: [Starlingx-discuss] openstack Failed to establish a new connection Hi， when I exploit openstack to build a network simulation, I encountered a problem like this. $ openstack server list unable to establish connection to http://nova-api-proxy.openstack.svc.cluster.local:8774/v2.1/a9e3d71fc89147e7...: HTTPConnectionPool(host='nova-api-proxy.openstack.svc.cluster.local', port=8774): Max retries exceeded with url: /v2.1/a9e3d71fc89147e7aadd28179c03df6c/servers/detail (Caused by NewConnection Error('urllib3.connection. HTTPConnection object at 0x7faeab41b510>: Failed to establish a new connection: [Errno -2] Name or service not known',)) After waiting for a period of time, execute "openstack server list" again, and this error will not appear. The irregular appearance of this error bothers me. Kind regards, Qihang Liu