Trying to point domain to my VPS and getting a 400 error

thanks for the answers guys, to clarify what I have setup:

Django settings.py allowed hosts:

ALLOWED_HOSTS = [‘128.199.120.162’, ‘codego.co’, ‘www.codego.co’]

Nginx server setup in /etc/nginx/sites-available:

“”"

server {
    listen 80;
    server_name 128.199.120.162 codego.co www.codego.co;

    access_log on;

location = /favicon.ico { access_log off; log_not_found off; }
location /static/ {
    root /home/david/codegoblog;
}
location /media/ {
    root /home/david/codegoblog;
}

location / {

    include         uwsgi_params;
    uwsgi_pass      unix:/run/uwsgi/codegoblog.sock;
}

}

“”"

this is a sample output of Nginx error log:

1.157.96.109, server: 128.199.120.162, request: “GET http://www.so.com/?rands=_160219332017520361821316 HTTP/1.0”, upstream: “uwsgi://unix:/run/uwsgi/firstsite.sock:”, host: “www.so.com” 2017/03/08 03:49:16 [crit] 28812#28812: *978 connect() to unix:/run/uwsgi/firstsite.sock failed (2: No such file or directory) while connecting to upstream, client: 61.157.96.109, server: 128.199.120.162, request: “GET http://m.baidu.com/?rands=_1507898306026201794660928 HTTP/1.0”, upstream: “uwsgi://unix:/run/uwsgi/firstsite.sock:”, host: “m.baidu.com” 2017/03/08 03:49:17 [crit] 28812#28812: *980 connect() to unix:/run/uwsgi/firstsite.sock failed (2: No such file or directory) while connecting to upstream, client: 61.157.96.109, server: 128.199.120.162, request: “GET http://www.sogou.com/?rands=_414056450811964332892176 HTTP/1.0”, upstream: “uwsgi://unix:/run/uwsgi/firstsite.sock:”, host: “www.sogou.com” 2017/03/08 04:16:11 [crit] 28812#28812: *984 connect() to unix:/run/uwsgi/firstsite.sock failed (2: No such file or directory) while connecting to upstream, client: 163.172.168.251, server: 128.199.120.162, request: “GET http://www.bing.com HTTP/1.1”, upstream: “uwsgi://unix:/run/uwsgi/firstsite.sock:”, host: “www.bing.com”

as you can see I have uwsgi as well and this is the error log from that:

Thu Feb 16 07:32:03 2017 - received message 0 from emperor SIGINT/SIGQUIT received…killing workers… worker 1 buried after 1 seconds worker 2 buried after 1 seconds worker 3 buried after 1 seconds worker 4 buried after 1 seconds worker 5 buried after 1 seconds goodbye to uWSGI. chdir(): No such file or directory [core/uwsgi.c line 1610] VACUUM: unix socket /var/uwsgi/codego.sock removed.

so there appear to be errors in both the nginx and uwsgi logs but then why is the site running just fine at http://128.199.120.162/ ?

This does not appear to be a DNS problem. The domain www.codego.co is resolving properly to the IP and the service is answering (though it is answering with an error). I would recommend reviewing your web server log files as there is likely more information to work from. If you can also share the configuration you’re using it would be helpful in identifying a source of the problem.