How to solve 502 Bad Gateway nginx?

Question

Nginx

Hello.

Installed ghost cms according to documentation on VPS.
It started, there are no errors in the logs.

When accessing the domain, it gives 502.

2021/01/16 09:16:18 [error] 397571#397571: *545 connect() failed (111: Connection refused) while connecting to upstream, client: 185.163.27.157, server: children-planet.ru, request: "GET / HTTP/2.0", upstream: "http://127.0.0.1:2369/", host: "blog.children-planet.ru"
2021/01/16 09:16:18 [error] 397571#397571: *545 connect() failed (111: Connection refused) while connecting to upstream, client: 185.163.27.157, server: children-planet.ru, request: "GET /favicon.ico HTTP/2.0", upstream: "http://127.0.0.1:2369/favicon.ico", host: "blog.children-planet.ru", referrer: "https://blog.children-planet.ru/"

The call is made to a subdomain, can this be a problem.
When it was tied to a domain, not a subdomain, everything worked.
DNS records are correctly configured.
I did not touch the nginx configuration, when installing ghost cms it seems to configure itself.

I also removed and reinstalled nginx, I think the problem may be in this

Settings in /etc/nginx/sites/available/blog.children-planet.ru.conf

server {
    listen 80;
    listen [::]:80;

    server_name blog.children-planet.ru;
    root /var/www/blog.children-planet.ru/system/nginx-root; # Used for acme.sh SSL verification (https://acme.sh)

    location / {
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header Host $http_host;
        proxy_pass http://127.0.0.1:2368;
        
    }

    location ~ /.well-known {
        allow all;
    }

    client_max_body_size 50m;
}

Answer 1

As I thought, the problem was that I removed and reinstalled nginx.
Cleaned up all garbage and restarted nginx and ghost cms