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How can I fix a localhost refused to connect error? [duplicate]

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?

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

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

A reason could also be in firewall refusing incoming connections on port 5000. Try:
sudo ufw allow 5000

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

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.

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

On MacOS 12.4 (Monterey) I couldn't load localhost nor my local IP but it worked with both of these:
0.0.0.0
127.0.0.1
Just change the URL in the browser if it loads with "localhost".

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.

Contrary to popular believe 127.0.0.1 is not the same a localhost.
I solved the issue above by setting 127.0.0.1 explicitly on both ends.

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...

The issue may occur, if VPN is on, so try to switch it off.

Django development server on LAN

It's my first time creating a django project. Now I'm at the point where I need to run the development server in the LAN. Except I can't get it to work.
My computer is connected with ethernet and the other computers in the network are connected via Wifi don''t know if that's relevant though.
What I tried by running the following:
The ip adress I found using ifconfig and copying inet addr: under ens33.
- python manage.py runserver myipadrres:8000
- python manage,py runserver 0.0.0.0:8000
The 0.0.0.0 doesn't even work on the windows os on my own computer. The ipadress does work for that.
Django settings debug is set to True.
Like I said it's the first time creating such a project and I don't know much about web related stuff. So I might have forgot to install something that I don''t know about.
Thanks in advance for your help
EDIT:
Managed to get it working i just had to turn on bridged networking in my VM settings
Greetings,
Dani

If that setup is working on your localmachine then
Just use that localmachine Ip:port-number in your LAN pc as:
for example :
If local machine Ip = 192.168.6.25 and setup is running on 8000 port ,then open browser at LAN machine PC and use this:
192.168.6.25:8000
Even you can run the setup on different port by this command
./manage.py runserver 0.0.0.0:<your_port>

Django tutorial: problems accessing development server

I am going through the Django tutorial and am running into problems when trying to view my webpage. I am at the very beginning of the tutorial when I first run the command python manage.py runserver xxx.xxx.xxx.xxx:8000 (replace the x's with my remote server's IP). When I try to navigate to http://xxx.xxx.xxx.xxx:8000 on my local machine, Chrome gives me the error ERR_CONNECTION_REFUSED. I have also tried running the server on 0.0.0.0:8000 and the same issue persists. The port is definitely open and there are no firewalls blocking it - when I plug in my IP and 8000 into this site it claims it is open: http://ping.eu/port-chk/.
I get no error messages on my console from the Django side of things. What could be causing this error? I really don't know much about servers or ports. Thanks in advance.
I am on a virtual Linux server running CentOS 6.4. My local machine is running Mac OS 10.9.5
EDIT:
When I run netstat --listen, port 8000 doesn't show up in the Local Address column, even though my Django dev server claims to be running. Someone mentioned to me that this means my application is not listening on this port. What does this mean and how do I remedy it?
EDIT:
I can access the page through my phone's internet with no issues. What gives?

If you're running Django inside a VM but accessing it from the host Mac, you'll need to forward the port. See the settings in Virtualbox/VMWare/whatever.
Note however that Django runs perfectly well directly on a Mac, so if you're just learning it may be simpler to just install it there.

Don't issue no IP, runserver will tell you where you can connect to when launching it.
Since you're launching it from your VM, you might supply the IP.
Ensure system level routing is okay.
Add your host local IP to the ALLOWED_HOSTS setting.

"Unable to bind localhost:8000" error while running sample application in google app engine

I have just installed GAE launcher and am trying to run a sample application to make sure it works and I am getting the below error.
raise BindError('Unable to bind %s:%s' % self.bind_addr)
google.appengine.tools.devappserver2.wsgi_server.BindError: Unable to bind localhost:8000
2014-03-24 10:54:54 (Process exited with code 1)
I am trying to run the python version of the app with python 2.7 and am using windows 8.1 operating system. I did not create any files for the app, I just created a new application and am trying to run it in localhost.
Can someone please tell me what this error means and how to fix it?

The app server starts two servers: one for your application, the other for development console.
Change the ip address for the development console with:
dev_appserver.py --admin_port=9000

Another process is already bound to port 8000. Use netstat -an or netstat -anb or similar to investigate. It may be another instance of your development server.
Edit: If port 8000 is really occupied, Command-line arguments in the The Python Development Server says you can append --admin_port to change the 8000 to another free port.

For me, I have to use both --admin-port and --port
dev_appserver.py --admin_port=9000 --port=9999 app.yaml

I hope it might help others using PyCharm to understand where to set the admin port to something different than 8000.
Go to your "Run/Debug configurations" and in the configuration tab, add the following into "additional options":
--admin_port=9000

manage.py runserver

I am running python manage.py runserver from a machine A
when I am trying to check in machine B. The url I typed is http://A:8000/ .
I am getting an error like The system returned: (111) Connection refused

You can run it for machines in your network by
./manage.py runserver 0.0.0.0:8000
And than you will be able to reach you server from any machine in your network.
Just type on other machine in browser http://192.168.0.1:8000 where 192.168.0.1 is IP of you server... and it ready to go....
or in you case:
On machine A in command line ./manage.py runserver 0.0.0.0:8000
Than try in machine B in browser type http://A:8000
Make a sip of beer.
Source from django docs

You need to tell manage.py the local ip address and the port to bind to. Something like python manage.py runserver 192.168.23.12:8000. Then use that same ip and port from the other machine. You can read more about it here in the documentation.

I was struggling with the same problem and found one solution. I guess it can help you. when you run python manage.py runserver, it will take 127.0.0.1 as default ip address and 8000. 127.0.0.0 is the same as localhost which can be accessed locally. to access it from cross origin you need to run it on your system ip or 0.0.0.0. 0.0.0.0 can be accessed from any origin in the network.
for port number, you need to set inbound and outbound policy of your system if you want to use your own port number not the default one.
To do this you need to run server with command python manage.py runserver 0.0.0.0:<your port> as mentioned above
or, set a default ip and port in your python environment. For this see my answer on
django change default runserver port
Enjoy coding .....

Just in case any Windows users are having trouble, I thought I'd add my own experience. When running python manage.py runserver 0.0.0.0:8000, I could view urls using localhost:8000, but not my ip address 192.168.1.3:8000.
I ended up disabling ipv6 on my wireless adapter, and running ipconfig /renew. After this everything worked as expected.

in flask using flask.ext.script, you can do it like this:
python manage.py runserver -h 127.0.0.1 -p 8000

For people who are using CentOS7, In order to allow access to port 8000, you need to modify firewall rules in a new SSH connection:
sudo firewall-cmd --zone=public --permanent --add-port=8000/tcp
sudo firewall-cmd --reload

I had the same problem and here was my way to solve it:
First, You must know your IP address.
On my Windows PC, in the cmd windows i run ipconfig and select my IP V4 address. In my case 192.168.0.13
Second as mention above: runserver 192.168.0.13:8000
It worked for me.
The error i did to get the message was the use of the gateway address not my PC address.

First, change your directory:
cd your_project name
Then run:
python manage.py runserver

Ok just came across this post this is a little off topic but hopefully explains a few things, The IP 127.0.0.1 points to your network card so any traffic that you cause to go to that IP address will not leave your computer.
For example modern network cards in laptops for example will not even give you that IP if you are not connected to a wifi or cabled network so you'll need to be connected at least to activate the card.
If you need to run multiple servers on the same machine but want to access them with a domain then you have a couple of options
edit your computers host file to define the domain and what IP it goes to
use a DNS Alias I set up using a cname record years ago *.local.irishado.com will point to 127.0.0.1
so for example these three domains will point to your local machine
http://site1.local.irishado.com
http://site2.local.irishado.com
http://site3.local.irishado.com
will all point to your local machine then in python projects you will need to edit the projects setting file ALLOWED_HOSTS property to hold the domain it will accept
ALLOWED_HOSTS = ['site1.local.irishado.com']