Name or service not known when running a Dash app

python flask plotly plotly-dash plotly-python

I solved the issue by setting the host and port manually:

if __name__ == '__main__':    app.run_server(host='127.0.0.1', port='8050', debug=True)

But I still have no clue why it started using http://x86_64-conda_cos6-linux-gnu:8050.

Any suggestion?

CodeHunter