How to access localhost from another computer on same network?

Question

I have written some flask api and running on http://localhost:5000/ . I want to test those api's from other computer which is connected in a same network. I am using windows 10.

What I have tried yet:

I did ipconfig/all and got ipv4 address . Wireless LAN adapter Wi-Fi:-> IPv4 Address: XX.XX.XXX.XXX(Preferred).
Ran XX.XX.XXX.XXX:5000 , but got "This site can’t be reached".

You can do `app.run("0.0.0.0", port=5000)` and from another machine, go to the server machines ip:5000 to access it. — Harshal Parekh, Nov 25 '19 at 06:18
Wireless LAN adapter Wi-Fi:-> IPv4 Address: XX.XX.XXX.XXX(Preferred).? is that one — VVK kumar, Nov 25 '19 at 06:22
@HarshalParekh "sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) could not connect to server: Cannot assign requested address" got this error by changing localhost to 0.0.0.0 — VVK kumar, Nov 25 '19 at 06:34
This will help: https://stackoverflow.com/questions/7023052/configure-flask-dev-server-to-be-visible-across-the-network — Harshal Parekh, Nov 25 '19 at 19:59

Sabith · Answer 1 · 2019-11-25T07:00:56.700

3

Open the port 5000 in your machine. Follow the steps:

Navigate to Control Panel, System and Security and Windows Firewall.
Select Advanced settings and highlight Inbound Rules in the left pane.
Right click Inbound Rules and select New Rule.
Add the port you need to open and click Next(5000 in your case).
Add the protocol (TCP or UDP) and the port number into the next window and click Next.
Select Allow the connection in the next window and hit Next.
Select the network type as you see fit and click Next.
Name the rule something meaningful and click Finish.

Then try to access through <your ip>:5000

sample code is as follows:

import flask

app = flask.Flask(__name__)
app.config["DEBUG"] = True


@app.route('/', methods=['GET'])
def home():
    return "<h1>Test Data</p>"

app.run(host='0.0.0.0')

and run your application through cmd as python api.py where api.py is the file name

edited Nov 25 '19 at 07:00

answered Nov 25 '19 at 06:20

Sabith

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i followed all steps but still getting connection refused . – VVK kumar Nov 25 '19 at 06:31
try :5000 from your machine itslef to make sure app is running or not – Sabith Nov 25 '19 at 06:33
I can access localhost:5000 but using this :5000 i cant. – VVK kumar Nov 25 '19 at 06:37
How do i get my ip? m using ip form : Wireless LAN adapter Wi-Fi:-> IPv4 Address: XX.XX.XXX.XXX(Preferred). – VVK kumar Nov 25 '19 at 06:39
goto command prompt, type 'ipconfig' – Sabith Nov 25 '19 at 06:40
yeah did that but from which section i need to pick IPV4 address ? there are Ethernet adapter vEthernet and Wireless LAN adapter Wi-Fi and so on – VVK kumar Nov 25 '19 at 06:42
Ethernet adapter vEthernet – Sabith Nov 25 '19 at 06:44
Yeah using that but still getting same .This site can’t be reached – VVK kumar Nov 25 '19 at 06:49
Try the sample code as well. Its working for me – Sabith Nov 25 '19 at 07:01
"sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) could not connect to server: Cannot assign requested address" got this error by changing localhost to 0.0.0.0 – VVK kumar Nov 25 '19 at 07:12
check this https://stackoverflow.com/questions/38849252/sqlalchemy-exc-operationalerror-psycopg2-operationalerror – Sabith Nov 25 '19 at 07:13
`my_ip:5000` from the same computer works but doesn't work from another computer in the same network. – Chupo_cro Feb 14 '21 at 16:28

score 2 · Answer 2 · answered Nov 25 '19 at 06:36

2

To access a Flask app from another machine, you need the app to bind to 0.0.0.0 instead of localhost (127.0.0.1). The latter won't route to another machine.

If you're running the app via python, use run(host='0.0.0.0').

If you're running the app the flask run, add --host=0.0.0.0

answered Nov 25 '19 at 06:36

Dave W. Smith

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"sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) could not connect to server: Cannot assign requested address" got this error by changing localhost to 0.0.0.0 – VVK kumar Nov 25 '19 at 06:40

score 1 · Answer 3 · answered Nov 25 '19 at 06:45

1

You can simply type the IP address of the host into your browser with the specified port number and you're good to go as both the computers are in the same network.

answered Nov 25 '19 at 06:45

Juhil Somaiya

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score -1 · Answer 4 · answered Nov 25 '19 at 06:36

-1

Might be easier to just make it public temporarily: https://ngrok.com/

But would be even easier to do your testing locally from the same machine.

answered Nov 25 '19 at 06:36

minboost

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How to access localhost from another computer on same network?

4 Answers4