My Node app not pointing to my IP Address

Alright I worked on troubleshooting this for a whole day, trying to get my Node app to be accesible via the browser but to no avail.

when I start my node via command line, it runs successfully on port 1100, but I cannot access either on my IP_address:port or domain: treck.co via the browser

this is my nginx config file

/etc/nginx/conf.d/boxedsales.com.conf

server { 
listen 80; 

server_name treck.co; 

location / { 
proxy_pass localhost:1100; 
proxy_http_version 1.1; 
proxy_set_header Upgrade $http_upgrade; 
proxy_set_header Connection 'upgrade'; 
proxy_set_header Host $host; 
proxy_cache_bypass $http_upgrade; 

} 
}

I have restarted nginx and also rebooted my droplet. Still cannot access when I visit on browser.

The node app is in directory /var/www/

Thanks