Dash App Only Accessible on 127.0.0.1, Not on 0.0.0.0 or Local Network IP

Dash Python
1

Hi everyone,

I’m developing a multi-page Dash app using dash.pages and dash-bootstrap-components. I want to make it accessible from other devices on my local network (e.g., via 0.0.0.0:8050 or 10.233.233.158:8050), but it only opens on 127.0.0.1:8050. Accessing the app from other machines or even using the server’s IP address in a browser on the same machine does not work. Also, on my Windows server, 0.0.0.0:8050 or 10.233.233.158:8050 is not opening on the browser!

Here’s my app.py:

import dash
from dash import html
import dash_bootstrap_components as dbc
from utils.b2b_db import init_db

# Initialize the Dash app with Bootstrap theme
app = dash.Dash(
    __name__,
    use_pages=True,  # Enable multi-page support
    external_stylesheets=[dbc.themes.BOOTSTRAP],
    suppress_callback_exceptions=True
)

# Initialize database
init_db()

# Create the navigation bar
navbar = dbc.Navbar(
    dbc.Container([
        dbc.NavbarBrand("ISP Analytics", href="/", className="ms-2"),
        dbc.Nav([
            dbc.NavLink(
                [html.Div(page["name"])],
                href=page["path"],
                active="exact",
            )
            for page in dash.page_registry.values()
        ])
    ]),
    color="dark",
    dark=True,
    className="mb-2"
)

# Layout
app.layout = html.Div([
    navbar,
    dash.page_container
])

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8050, debug=False)

I’ve verified that:

  • My firewall is disabled or allows traffic on port 8050.
  • No errors are raised when I run the app.
      (venv) E:\ISP DASH>python app.py
 Dash is running on http://0.0.0.0:8050/

      Serving Flask app 'app'
      Debug mode: off
     WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.
      Running on all addresses (0.0.0.0)
      Running on http://127.0.0.1:8050
      Running on http://10.233.233.158:8050 ```
  • The development server starts, but only 127.0.0.1:8050 works.

How can I make this app accessible from another machine on the same network using the local IP (like 10.233.233.158:8050)? Any help would be appreciated.

Thanks!

2

Could you take a screenshot of the firewall setting rules on your system?

4

I figured out that the root cause was NecoRay – it was blocking my traffic on that port. I resolved it by changing the network and adding an exception in Internet Options > LAN Settings. Everything’s working fine now!

2 Likes
5

If you’re trying to share your app with other devices, you may consider publishing it to Plotly Cloud, which is in Early Access with no waitlist. You can learn about how to get access here: Plotly Studio Early Access: The Wait(list) is Over!

Good luck and if you have any issues don’t hesitate to send me a note!