NGINX (13 Permission Denied) When Passing Port Through PM2 EcoSystem Config File - node.js

Question

I am using NGINX and PM2 to run a NodeJS app on an EC2 instance. The app runs on port 9443 and NGINX is listening in on port 443.
When I hardcode port 9443 directly into my index.js everything works great, but if I pass in the port via the PM2 ecosystem config file, I get a 502/bad gateway error and the 13: Permission Denied error in my NGINX error.log file. Could someone help me with this?
nginx.conf
# For more information on configuration, see:
# * Official English Documentation: http://nginx.org/en/docs/
# * Official Russian Documentation: http://nginx.org/ru/docs/
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;
events {
worker_connections 1024;
}
http {
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;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
# Load modular configuration files from the /etc/nginx/conf.d directory.
# See http://nginx.org/en/docs/ngx_core_module.html#include
# for more information.
include /etc/nginx/conf.d/*.conf;
}
server.conf
server {
listen 80;
listen [::]:80;
server_name $MY_SERVER_NAME$;
return 301 https://$host$request_uri;
}
server {
listen 443 ssl;
listen [::]:443 ssl;
access_log /location/to/logs;
ssl_certificate /location/to/cert;
ssl_certificate_key /location/to/cert/key;
server_name $MY_SERVER_NAME$;
location / {
proxy_set_header HOST $host;
proxy_set_header X-REal-IP $remote_addr;
proxy_pass http://127.0.0.1:9080;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
}
ecosystem.config.js
module.exports = {
apps: [
{
name: 'my-server',
cwd: '/home/centos/my-server',
script: '/home/centos/my-server/index.js',
watch: ['/home/centos/my-server/'],
ignore_watch: ['/home/centos/my-server/node_modules'],
env_production: {
NODE_ENV: 'production',
PROD_PORT: 9080,
},
},
],
};
Output of ps aux | grep nginx and ps aux | grep pm2
root 847 0.0 0.0 119320 2240 ? Ss 16:52 0:00 nginx: master process /usr/sbin/nginx
nginx 848 0.0 0.2 152000 10084 ? S 16:52 0:00 nginx: worker process
nginx 849 0.0 0.2 152000 8076 ? S 16:52 0:00 nginx: worker process
centos 1259 0.6 1.4 837268 54648 ? Ssl 17:00 0:00 PM2 v4.5.6: God Daemon (/home/centos/.pm2)
index.js: not the full file, but the part where the PORT is used
const http = require('http');
const winston = require('winston');
const nconf = require('nconf');
module.exports = async function (app) {
const DEV_PORT = 9080;
if (nconf.get('nodeEnv') === 'local') {
app.listen(DEV_PORT, () => winston.info(`Listening on port ${DEV_PORT}...`));
} else {
http.createServer(app).listen(process.env.PROD_PORT);
}
};