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Cannot access Django server on EC2 instance

I created an EC2 instance. Installed Python 3.4 on it and then installed Django 1.10.6 on it. I was trying to develop my first django application
I started django server.
python manage.py runserver
I could not access at http://n.n.n.n:8000.
I get a ERR_CONNECTION_REFUSED error.
I went back to the EC2 instance and added the protocol/port to the security group. This is how it looks after I add the port/proptocol
Custom TCP Rule TCP 8000 0.0.0.0/0
Custom TCP Rule TCP 8000 ::/0
It did not work. I even added a rule to allow all traffic from anywhere. It still did not work.
However, if I start django server the following way
python manage.py runserver 0.0.0.0:8000
I get the following error:
DisallowedHost at /
Invalid HTTP_HOST header: 'n.n.n.n:8000'. You may need to add 'n.n.n.n' to ALLOWED_HOSTS.
If tried adding the IP to ProjectName/settings.py,
ALLOWED_HOSTS = ['n.n.n.n'] #Make sure your host IP is a string
I get the ERR_CONNECTION_REFUSED error
I can ping the IP. I can ssh (there is rule to allow ssh). Does not look like there is a firewall.
$ sudo service iptables status
iptables: Firewall is not running.
Why am I not able access http/django server?
Thanks

Actually, I must not have started the server right, when I added the host to the ProjectName/settings.py file. I tried again, and this time it worked.
So looks like
django server started on EC2 instances with the following
python manage.py runserver
may not be accessible from other machines.
django server started with the following
python manage.py runserver 0.0.0.0:8000
would be accessible from the Internet provided the IP address of the host machine is added to the ALLOWED_HOSTS in the ProjectName/settings.py file
ALLOWED_HOSTS = ['n.n.n.n'] #Make sure your host IP is a string
This is all in addition to the entries in the security group

The IP to the allowed hosts means the IP of the devices which you want to access Django from.

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.

How to fix the connection error in django

I have created a new project in django. when I run python manage.py runserver, I am getting the msg in command prompt like below.
/var/www/samplepro/myapp$ python manage.py runserver
Performing system checks...
System check identified no issues (0 silenced).
March 26, 2015 - 10:52:31
Django version 1.7.7, using settings 'myapp.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
when I test in browser, I am getting the page can't be displayed error. Can anyone help me to do get the django page.

You stated that you are running the server on Ubuntu while you are trying to connect it from another PC running Windows. In that case, you should replace the 127.0.0.1 with the actual IP address of Ubuntu server (the one you use for PuTTY).

I am also developing in a virtual machine.
Use ifconfig to figure out the IP address that has been assigned to your virtual machine.
Then start the server with:
python manage.py runserver <IP>:8000
Of course you could also use a different port instead of 8000. Then use that address and port in your host browser to access your server.
Note: At least in my VM, the virtual machine gets a new address from time to time, so check that in case you have trouble starting your server with the same command.
If this does not help, check your hosts file as mentioned in one of the comments.

How do I access my django app running on Amazon ec2?

So, I have looked around stack overflow + other sites, but havent been able to solve this problem: hence posting this question!
I have recently started learning django... and am now trying to run it on ec2.
I have an ec2 instance of this format: ec2-xx-xxx-xx-xxx.us-west-2.compute.amazonaws.com on which I have a django app running. I changed the security group of this instance to allow http port 80 connections.
I did try to run it the django app the following ways: python manage.py runserver 0.0.0.0:8000 and python manage.py runserver ec2-xx-xxx-xx-xxx.us-west-2.compute.amazonaws.com:8000 and that doesnt seem to be helping either!
To make sure that there is nothing faulty from django's side, I opened another terminal window and ssh'ed into the instance and did a curl GET request to localhost:8000/admin which went through successfully.
Where am I going wrong? Will appreciate any help!

You are running the app on port 8000, when that port isn't open on the instance (you only opened port 80).
So either close port 80 and open port 8000 from the security group, or run your app on port 80.
Running any application on a port that is less than 1024 requires root privileges; so if you try to do python manage.py runserver 0.0.0.0:80 as a normal user, you'll get an error.
Instead of doing sudo python manage.py runserver 0.0.0.0:80, you have a few options:
Run a pre-configured AMI image for django (like this one from bitnami).
Configure a front end server to listen on port 80, and then proxy requests to your django application. The common stack here is nginx + gunicorn + supervisor, and this blog post explains how to set that up (along with a virtual environment which is always a good habit to get into).

Make sure to include your IPv4 Public IP address in the ALLOWED_HOSTS section in Django project/app/settings.py script...

Accessing django project in LAN systems

I used django and developed a site which is working fine, and its about to move to production and ready for deployment in a couple of weeks.
So before moving to production, i want to share the site with some of my employees to check the functionality and something else. Actually their systems are connected in LAN with mine.
So my system IP address is something like 192.168.12.135, when we run run django development server its runs at localhost:8000, i mean with the system IP address and with a port 8000 like 192.168.12.135:8000 right.
So i had shared them the project site link as 192.168.12.135:8000, but when they tried on the systems which are connected in LAN, it is not accessible and displaying an error Server not found.
I tried the above same way because recently i used python web.py framework and developed a minimal site , and when we run the server, it by default runs as localhost:8080 , and when i accessed this link from others system that are connected in LAN with mine as 192.168.12.135:8000 , its working fine and is accessible.
So can anyone please let me know
1. How to access the site on the systems that are connected in LAN before moving to production(in some real servers like apache, nginx etc.,).
2. Basically i am new to web developing and this is my first site developed in python, so
i don't know more about servers and deploying a project. So can anyone please let me know
the detailed information about deploying django on different servers
(First of all i am looking for a solution for 1st problem(Accessing in LAN before moving to
production))

If you run
python manage.py runserver 0.0.0.0:8000
your development server will be available on port 8000 to anyone on your LAN and on localhost as well (and it does not depend on your ip address)

You need to explicitly tell the development server to run on your IP rather than localhost.
Try python manage.py runserver your_ip:port.
Though it'll be accessible if you're running through apache or any other webservers other than the development server.
And to your 1st question, I would advice you to host and use a local apache server rather than using development server. Doing so, you can foresee the issues you'll be facing when moving to production.
And to 2nd, there are plenty of resources available configuring Django with different servers. Hail Google. :)

In your settings.py change ALLOWED_HOSTS to
ALLOWED_HOSTS = ['*']
Run your server by entering the following command
python manage.py runserver 0.0.0.0:8000
In order to access the project from another device enter the IP address of the server followed by the port number, which is 8000 in this example.

On windows I did everything you said but one thing was missing at my end to connect through Wi-Fi..
In settings.py:
ALLOWED_HOST = ['*']
Put Network profil in Private mode:
Windows > Settings > Network & Internet > Wi-Fi > (Click on_your_network) > In Network profil select: Private
Exemple: Run your server on the port 8000:
python manage.py runserver 0.0.0.0:8000
Then to access to the server with your other devices connected to the same network, enter the IPv4's server address with the your port (here 8000)
Exemple, if the IPv4's server address is 192.168.20.26 put the folling text directly in your browser:
192.168.20.26:8000