Domain name rejected by nginx - ruby-on-rails

Question

I have a server running a very simple rails app. It has nginx set up to listen on port 80, which further forwards the request to a unicorn socket file under (Rails.root)/tmp/unicorn.sock.
I bought a domain name from domain.com and pointed it to my server's address=.
e.g.
Domain: mydomain.com -> Server: 110.56.45.12
Everything works great when I hit the server directly, by either visiting 110.56.45.12 in my browser or ssh-ing into the box and running curl 127.0.0.1. I assume this is because both these actions hit port 80 and nginx serves back the correct content.
However when I try to use the public domain name domain.com or I try curl localhost I get the classic "We're sorry, but something went wrong." rails page.
I checked the rails production log and there is nothing there. I then checked nginx error log at /var/log/nginx/error.log and only got
2015/05/27 07:01:24 [error] 20041#0: *143 connect() to unix:/home/jeeves/my_app/tmp/unicorn.sock failed (111: Connection refused) while connecting to upstream, client: 127.0.0.1, server: mydomain.com, request: "GET / HTTP/1.1", upstream: "http://unix:/home/jeeves/my_app/tmp/unicorn.sock:/", host: "localhost"
Is there any reason my server is rejecting that connection?
Thanks!
EDIT
Here's my nginx.conf file
user jeeves;
worker_processes 1;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
http {
##
# Basic Settings
##
sendfile on;
tcp_nopush on;
tcp_nodelay off;
keepalive_timeout 65;
types_hash_max_size 2048;
server_tokens off;
include /etc/nginx/mime.types;
default_type application/octet-stream;
##
# Logging Settings
##
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
error_log /var/log/nginx/error.log;
##
# Gzip Settings
##
gzip on;
gzip_disable "msie6";
gzip_http_version 1.1;
gzip_proxied any;
gzip_min_length 500;
gzip_types text/plain text/xml text/css
text/comma-separated-values text/javascript
application/x-javascript application/atom+xml;
##
# Unicorn Rails
##
upstream unicorn {
server unix:/home/jeeves/my_app/tmp/unicorn.sock fail_timeout=0;
}
##
# Includes
##
include /etc/nginx/sites-enabled/*;
}
The last line includes everything in the sites-enabled directory, which is only one file - mydomain.com
server {
listen 80;
server_name mydomain.com; # Replace this with your site's domain.
keepalive_timeout 300;
client_max_body_size 4G;
# Set this to the public folder location of your Rails application.
root /home/jeeves/my_app/public;
try_files $uri/index.html $uri.html $uri #unicorn;
location #unicorn {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header X-Forwarded_Proto $scheme;
proxy_redirect off;
# This passes requests to unicorn, as defined in /etc/nginx/nginx.conf
proxy_pass http://unicorn;
proxy_read_timeout 300s;
proxy_send_timeout 300s;
}
# You can override error pages by redirecting the requests to a file in your
# application's public folder, if you so desire:
error_page 500 502 503 504 /500.html;
}