Have server with installed nginx and php-fpm. Some sctript need access to part of site via curl. But it fails. I tried to run curl on server :

curl -v -i alexcoder.info
* About to connect() to alexcoder.info port 80 (#0)
* Trying 88.198.156.238...
* Connection refused
* couldn't connect to host
* Closing connection #0
curl: (7) couldn't connect to host

But from network sites available :

curl -v -i alexcoder.info
* Rebuilt URL to: alexcoder.info/
* Adding handle: conn: 0x702b10
* Adding handle: send: 0
* Adding handle: recv: 0
* Curl_addHandleToPipeline: length: 1
* - Conn 0 (0x702b10) send_pipe: 1, recv_pipe: 0
* About to connect() to alexcoder.info port 80 (#0)
* Trying 88.198.156.238...
* Connected to alexcoder.info (88.198.156.238) port 80 (#0)
> GET / HTTP/1.1
> User-Agent: curl/7.32.0
> Host: alexcoder.info
> Accept: */*
> 
< HTTP/1.1 200 OK

HTTP/1.1 200 OK

nginx logs does not contain any errors aboout this. I tried to flush iptables rules but it take no effect.

What it may be?

Multiple servers

You need to setup a listener for each network interface you want Nginx to respond to:

server {
 listen 80;
 server_name localhost;

 #charset koi8-r;

 #access_log logs/host.access.log main;

 location / 
 root html;
 index index.html index.htm;
 

You likely already have a server .. section that's listening on the actual interface that your system binds to when it gets an IP address.

Multiple listeners

You can also add multiple Listen lines to a server .. section like so:

Examples

listen *:80;

or

listen localhost:80;
listen 127.0.0.1:80;
listen 12.34.56.78:80;

I would likely do it using this second method! See this article for more examples, titled: - Basic Nginx Configuration.

References

• Server Names - Nginx Documentation


• Server Block Examples


• NGINX multiple server blocks with reverse proxy


• Basic Nginx Configuration

I have also facing same issue. I have configure the file in sites-enabled. The file configuration is given below.
upstream backend
server localhost:3000;

we're in the http context here

map $http_upgrade $connection_upgrade

# default upgrade;
# '' close;

server

listen 81 default_server;

# listen [::]:81 default_server;

listen 80; 
server_name track.xxxxxxxxxx.com;
server_tokens off;
return 301 https://$host$request_uri;

the secure nginx server instance

server

# listen 443 ssl;
# ssl_certificate /etc/ssl/certs/.domainName.1.2018.chain.crt;
# ssl_certificate_key /etc/ssl/private/.domainName.1.key;
#server_name xyz;
# location /
# proxy_set_header X-Real-IP $remote_addr;
# proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
# proxy_set_header Host $http_host;
# proxy_http_version 1.1;
# proxy_set_header Upgrade $http_upgrade;
# proxy_set_header Connection $connection_upgrade;
# proxy_set_header X-NginX-Proxy true;
# proxy_set_header X-Ssl on;
# proxy_pass http://localhost:3000;
# proxy_redirect off;
#

the secure nginx server instance

server
listen 443 ssl;
ssl_certificate /etc/ssl/certs/.domainName.1.2018.chain.crt;
ssl_certificate_key /etc/ssl/private/.domain.1.key;

listen 80 default_server;

server_name track.xxxxxxxxxx.com;

server_name _;

 location / 
 proxy_set_header X-Real-IP $remote_addr;
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 proxy_set_header Host $http_host;
 proxy_set_header X-NginX-Proxy true;
 proxy_set_header X-Ssl on;
 proxy_pass http://localhost:3000;
 proxy_redirect off;

server
listen 7003;
server_name localhost;
root /opt/ClientFolder/;
location /
try_files $uri @backend;

location @backend 
 proxy_pass https://backend;
 proxy_set_header X-Real-IP $remote_addr;
 proxy_set_header Host $host;
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 # Following is necessary for Websocket support
 proxy_http_version 1.1;
 proxy_set_header Upgrade $http_upgrade;
 proxy_set_header Connection "upgrade";

Please do needful.