You add rabbitmq to a Compose file, point Celery or Spring AMQP at amqp://guest:guest@localhost:5672/ , and the client dies with Connection refused . Or the TCP path works and you still get ACCESS_REFUSED - Login was refused using authentication mechanism PLAIN . The broker log may say user 'gu...

Source: [Dev.to](https://dev.to/deploylark/rabbitmq-in-docker-fix-accessrefused-and-connection-refused-41ea)

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