How to redirect my sub-domain to localhost:5000 in Https with Nginx?

I've a problem with my nginx :

I have to redirect all the http and https traffic when my users search "hermes.my-domain.com" to the 5000 port, on my nginx serveur, where my app is.

"hermes" is the name of my sub-domain.

So I do that :

server {

listen    80;
server_name    hermes.my-domain.com;

return 301 https://hermes.my-domain.com$request_uri;
} 

server {

listen    443;
ssl_certificate           /etc/certs/ssl/bundle.crt;
ssl_certificate_key       /etc/certs/ssl/server.key;

    location / {
        proxy_pass http://localhost:5000;
        proxy_redirect off;
        proxy_set_header Host $host:$server_port;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Ssl on;
    }
}

Every time I fall on a 502 error.

I don't understand what's happen...

if someone know the problem please ?

Thank you very much !

This is my result from error.log :

My apologies, this is my result from error.log :

    2021/11/24 09:09:44 [error] 19384#19384: *332 connect() failed (111: Connection refused) while connecting to upstream, client: 10.10.1.158, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:5000/", host: "hermes.my-domain.com"

2021/11/24 09:09:44 [error] 19384#19384: *332 connect() failed (111: Connection refused) while connecting to upstream, client: 10.10.1.158, server: , request: "GET / HTTP/1.1", upstream: "http://[::1]:5000/", host: "hermes.my-domain.com"

2021/11/24 09:09:44 [error] 19384#19384: *332 no live upstreams while connecting to upstream, client: 10.10.1.158, server: , request: "GET /favicon.ico HTTP/1.1", upstream: "http://localhost/favicon.ico", host: "hermes.my-domain.com", referrer: "https://hermes.my-domain.com/"

Thank you for your help all !

Your application server is not listening on Port 5000.

connection refused indicates that nothing is listening on that port on that interface.

An empty output of ss -tnlp |grep :5000 confirms that nothing is listening on that port.

If your application server is indeed running, check it's configuration for the correct port. If it is not running, start it.