Flask server not visible from my public ip address

Question

I'm trying to run a flask server on my desktop PC that is publicly available on the internet. I've done the following:

• Set up a static IP address: 192.168.1.11 (http://i.imgur.com/Z9GEBYV.png)
• Forwarded port 33 on my router to my static ip address (http://i.imgur.com/KGNQ2Qk.png)
• Setup flask to use my static ip and port: 33

I'm using the following code as a test webserver

from flask import Flask, request, redirect
app = Flask(__name__)

@app.route("/")
def hello_world():
    return "Test 123 "

if __name__ == "__main__":
    app.run(host="0.0.0.0", port="33")

When I open my browser to: http://192.168.1.11:33/ the page displays properly, I see "Test 123"

My problem comes when trying to connect to my webserver from my public ip address When I open my browser to http://xx.xxx.xxx.xx:30 (my ip address) all I see is "this site can't be reached, xx.xxx.xxx.xx refused to connect"

I've looked up all the stack overflow answers, I've done the following:

• Turned off windows firewall
• Changed host from "192.168.1.11" to "0.0.0.0"
• Tried a different port

screenshot of code running and error shown: http://i.imgur.com/a05GvEs.png

My question is: What do I need to do to make my flask server visible from my public ip address?

Answer 1

Do you have DHCP activated on your router? If yes do you see your host as 192.168.1.11 in there?

You have to use '0.0.0.0' on host, that tells Flask to listen on all addresses. Try specifying the port with quotes as app.run(host="0.0.0.0", port="33")

Answer 2

You must give the public ip address/LAN ip address as an argument to app.run method. When you don't provide host argument, it works fine with http://localhost:8888/ and http://127.0.0.1:888/, but not to access outside the system where you are running the REST services

Following is the example. app.run(host="192.168.0.29",debug=True, port=8888)