我是Django的新手，我正在尝试通过python3 manage.py runserver运行测试服务器。我得到的消息说一切进展顺利：
Performing system checks...
System check identified no issues (0 silenced).
You have 15 unapplied migration(s). Your project may not work properly
until you apply the migrations for app(s): admin, auth, contenttypes,
sessions.
Run 'python manage.py migrate' to apply them.
January 28, 2019 - 19:15:50
Django version 2.1.5, using settings 'mytestsite.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
当我尝试从Chrome浏览器连接到http://127.0.0.1:8000/时，仍然得到有关该网站无法访问的信息。我在Ubuntu上的防火墙配置：
Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), disabled (routed)
New profiles: skip
To Action From
-- ------ ----
22/tcp (OpenSSH) ALLOW IN Anywhere
8000 ALLOW IN Anywhere
Anywhere ALLOW IN 127.0.0.1
22/tcp (OpenSSH (v6)) ALLOW IN Anywhere (v6)
8000 (v6) ALLOW IN Anywhere (v6)
还有什么问题呢？这是我的第一个设置。感谢您的帮助。