Can't connect to Flask web service, connection refused
PythonFlaskPython Problem Overview
I'm trying to run a simple web server on a Raspberry Pi with Flask. When I run my Flask app, it says:
> running on http://127.0.0.1:5000/
But when I enter this address on my laptop's in Chrome, I get
> ERR_CONNECTION_REFUSED
I can open 127.0.0.1:5000 on the Raspberry Pi's browser. What do I need to do to connect from another computer?
Python Solutions
Solution 1 - Python
Run your app like this:
if __name__ == '__main__':
app.run(host='0.0.0.0')
It will make the server externally visible. If the IP address of the machine is 192.168.X.X then, from the same network you can access it in 5000 port. Like, http://192.168.X.X:5000
Solution 2 - Python
A reason could also be in firewall refusing incoming connections on port 5000. Try:
sudo ufw allow 5000
Solution 3 - Python
when you are running the server via flask run change it to flask run --host=0.0.0.0
to connect, find the IPV4 address of the server that your script is running on. On the same network, go to http://[IPV4 address]:5000
Solution 4 - Python
app.run(host='0.0.0.0',port=5000)
if you run your app in this way then your server will be visible externally. Steps by Setp:
-
Run your app by using the following command
app.run(host='0.0.0.0',port=5000)
-
Go to the window cmd . Type ipconfig and get the get the IPV4 adress suppose your IPV4 address is 192.168.X.X
-
Go to the mobile browser and type the 192.168.X.X:5000
Solution 5 - Python
If you have debug = True inside your app.run(), then it will not be visible to other machines either. Specify host and port inside app.run() without the debug = True.
Solution 6 - Python
You will have to run the development server such that it listens to requests on all interfaces and not just the local one
Ask Flask to listen on 0.0.0.0:PORT_NUMBER
or any other port you may choose
Solution 7 - Python
- Both devices must be connected to same network.
- Use
app.run(host='0.0.0.0',port=5000)and run with your own Ipv4 address like his http://[Your Ipv4 address]:5000 - If you are connecting this with android app then don't forget to put INTERNET permission in manifest file.
Solution 8 - Python
Well i was also here to know answer but i guess i found out problem. The reason is that you may not activated or run flask that's why it is showing error. For that you have to start from terminal "flask run" and then surely your flask will run...
Solution 9 - Python
The issue may occur, if VPN is on, so try to switch it off.