Passenger + Rails app only works on port 3000 - ruby-on-rails

Question

Passenger will start up on port 80, but only the home page (which is 100% HTML) shows up. No other page will resolve. And even stranger, all traffic that fails to resolve is forwarded to HTTPS (which, of course, also fails to resolve).
This works:
rvmsudo passenger start --daemonize
This does not work:
rvmsudo passenger start --daemonize --port 80
My config.ru is pretty standard, too:
require ::File.expand_path('../config/environment', __FILE__)
run Rails.application
I am using Rails 4.2.0 and Ruby 2.2.2 with Passenger 5.0.7
Anyone have any ideas?
nginx conf:
user www-data;
worker_processes 4;
pid /run/nginx.pid;
events {
worker_connections 768;
# multi_accept on;
}
http {
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
# server_tokens off;
include /etc/nginx/mime.types;
default_type application/octet-stream;
##
# Logging Settings
##
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
##
# Gzip Settings
##
gzip on;
gzip_disable "msie6";
##
# nginx-naxsi config
##
# Uncomment it if you installed nginx-naxsi
##
#include /etc/nginx/naxsi_core.rules;
##
# nginx-passenger config
##
# Uncomment it if you installed nginx-passenger
##
passenger_root /usr/lib/ruby/vendor_ruby/phusion_passenger/locations.ini
#passenger_ruby /home/ubuntu/.rvm/gems/ruby-2.2.2
app specific conf:
map $http_upgrade $connection_upgrade {
default upgrade;
'' close;
}
server {
listen 80;
server_name www.mydomain.com;
# Tells Nginx to serve static assets from this directory.
root /var/www/mydomain/public;
location / {
# Tells Nginx to forward all requests for www.foo.com
# to the Passenger Standalone instance listening on port 4000.
proxy_pass http://127.0.0.1:4000;
# These are "magic" Nginx configuration options that
# should be present in order to make the reverse proxying
# work properly. Also contains some options that make WebSockets
# work properly with Passenger Standalone. Please learn more at
# http://nginx.org/en/docs/http/ngx_http_proxy_module.html
proxy_http_version 1.1;
proxy_set_header Host $http_host;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $connection_upgrade;
proxy_buffering off;
}
}

Answer 1

I think you need a different "setup"/configuration if you want to run passenger behind a nginx.
Nginx should listen on port 80 (its specified in the server-section of your nginx.conf), and forwards traffic to your app running under passengers hood (specified in nginx.conf to be on port 4000, but started by hand at port 80), if I do not misread.
Probably nginx tells you that its unhappy in its logfile /var/log/nginx.log I believe. You can confirm what is sitting on port 80 by executing netstat -tlpn .