502 Bad Gateway

Hello everyone,

I am having a 502 gateway error that I have tried to debug but nothing I have tried so far is working. I have an app running on Nginx with Let’s Encrypt using a domain connected through DO. All the other DNS records using the same system (Let’s encrypt and Nginx) are working fine but this new DNS records isn’t quite connecting and I can’t trace it. Maybe I have been looking at it for too long.

Here is my error long from Nginx:

2023/01/02 09:20:57 [error] 58437#58437: *2 connect() failed (111: Connection refused) while connecting to upstream, client: 76.113.138.139, server: repair.tech-works.xyz, request: "GET /login HTTP/1.1", upstream: "http://[::1]:3011/login", host: "repair.tech-works.xyz"
2023/01/02 09:20:57 [error] 58437#58437: *2 connect() failed (111: Connection refused) while connecting to upstream, client: 76.113.138.139, server: repair.tech-works.xyz, request: "GET /login HTTP/1.1", upstream: "http://127.0.0.1:3011/login", host: "repair.tech-works.xyz"
2023/01/02 09:20:57 [error] 58437#58437: *2 no live upstreams while connecting to upstream, client: 76.113.138.139, server: repair.tech-works.xyz, request: "GET /favicon.ico HTTP/1.1", upstream: "http://localhost/favicon.ico", host: "repair.tech-works.xyz", referrer: "https://repair.tech-works.xyz/login"

Here is my Nginx sites-available code(I only added the server block for the affected DNS record):

server {

  listen 80;
  listen [::]:80;

  root /home/ifeasome/projects/repair-shop;
  index index.html index.htm index.nginx-debian.html;

  server_name repair.tech-works.xyz www.repair.tech-works.xyz;

  location / {
    proxy_pass http://localhost:3011;
    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;

  }
    listen [::]:443 ssl; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/tech-works.xyz/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/tech-works.xyz/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}

If it helps, my Nginx conf. file check returns ‘successful’ message. Please can you point to me towards what I am missing. I have been agonising over this for a while

Thank you so much!