Connection refused [Errno 111] when typing swift start command

Question

When I type the swift stat command, this error appears:

HTTPConnectionPool(host='controller', port=8080): Max retries exceeded with url: /v1/AUTH_d17698cf7bbf4dcc8fc59ed6f7b48052 (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f1b0c2939a0>: Failed to establish a new connection: [Errno 111] Connection refused'))

And when I type this command to see if there's a listen on port 8080, nothing appears:

netstat -tanpu | grep ":8080"

and when I try to restart or start the swift service with service swift-proxy restart, an error appears:

Assertion failed on job for swift-proxy.service.