Django manage.py runserver无法正常工作

尝试使用命令启动服务器时遇到问题

python manage.py runserver 0.0.0.0:8000

它显示

C:\abc>python manage.py runserver 0.0.0.0:8000
Validating models...

0 errors found
Django version 1.4.9, using settings 'abc.settings'
Development server is running at http://0.0.0.0:8000/
Quit the server with CTRL-BREAK.

但无法通过浏览器访问 http://127.0.0.1:8000

它显示：

Unable to connect

Firefox can't establish a connection to the server at 127.0.0.1:8000.

The site could be temporarily unavailable or too busy. Try again in a few moments.
If you are unable to load any pages, check your computer's network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.

但是当我尝试通过

python manage.py runserver 

它工作正常。我可以访问该应用程序http://127.0.0.1:8000

可能是什么问题。