Port 8081 on Airflow [closed]

I'm on a Ubuntu image in VirtualBox.I work with a container in Docker, which incorporates Airflow.When I want to enter port 8081 to see the airflow interface, I cannot.Set the container port from 8080 to 8081.

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In the browser I have this error:

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Configure the image network:

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and docker-compose-yaml:

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Thank you

I need to be able to connect to port 8081 to access the Airflow web application