Nginx not proxying to remote host?

Question

linux

Hello!
Faced the problem that nginx does not proxy the remote host. Onlyoffice from docker is running on the remote host.
When I open the application by ip / name: port - the remote server works with the office.
The virtual stand is located in the local network.
nginx config:

server {
server_name apps.lab.lan;
rewrite ^ https://apps.lab.lan$request_uri? permanent;
}
server {
listen 80;
listen 443 ssl;
server_name apps.lab.lan;
ssl_certificate /home/ssl/apps-certs/apps.lab.lan.crt;
ssl_certificate_key /home/ssl/apps-certs/apps.lab.lan.key;
ssl_session_cache off;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers ALL:!DH:!EXPORT:!RC4:+HIGH:+MEDIUM:!LOW:!aNULL:!eNULL;
gzip on;
gzip_min_length 1000;
gzip_http_version 1.0;
gzip_variable on;
gzip_comp_level 5;
gzip_proxied any;
gzip_types text/plain text/css text/javascript application/json;
client_max_body_size 100m;
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-Forwarded-Proto $scheme;
proxy_pass https://192.168.1.27:9443;
proxy_connect_timeout 60s;
proxy_read_timeout 60s;
proxy_send_timeout 60s;
proxy_ssl_verify off;
proxy_request_buffering off;
}
}

In the nginx log, such warnings sometimes slip through.

2017/10/03 17:58:38 [warn] 2522#2522: conflicting server name "apps.lab.lan" on 0.0.0.0:80, ignored

From the Nginx host, the reverse proxy works to another application, but they are on the same host, and it does not work on the remote host. Self-signed certificates.
The config is almost the same, only the headers differ depending on the application.
Any information on this topic will be relevant, troubleshooting and comments.
Thanks in advance!

Answer 1

1. Two server sections have the same server_name , and the proxy is configured only in the second one. This is potentially the source of the problem.
2. Try to separate the receiving server into a separate upstream block and add it to the proxy-pass.

Answer 2

What prevents you from referring to the official documentation with examples of settings, and not to fence the garden?
https://github.com/ONLYOFFICE/document-server-prox...
In my project, HTTPS-to-HTTPS proxying on Nginx is configured like this:

http {

        # Websocket
        map $http_upgrade $connection_upgrade {
                default upgrade;
                ''      close;
        }

server {
...  
          lingering_time 86400;
          proxy_ssl_verify off;
          proxy_ssl_session_reuse on;
          proxy_ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
          proxy_cache off;
          proxy_store off;

          set $ssl off;
          set $port 80;
          if ($scheme = https) {
              set $ssl on;
              set $port 443;
          }

        location / {
            proxy_pass https://192.168.XX.XX:8443/;
            gzip off;
            proxy_read_timeout          600s;
            proxy_connect_timeout       600s;
            proxy_redirect              off;
            proxy_buffering             off;
            proxy_request_buffering     off;
            proxy_http_version          1.1;
            proxy_set_header Host                   $http_host;
            proxy_set_header X-Real-IP              $remote_addr;
            proxy_set_header X-Forwarded-Ssl        $ssl;
            proxy_set_header X-Forwarded-For        $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto      $scheme;
            proxy_set_header X-Forwarded-Port       $port;
            proxy_set_header X-Frame-Options        SAMEORIGIN;
            proxy_set_header Upgrade                $http_upgrade;
            proxy_set_header Connection             $connection_upgrade;
            proxy_set_header Referer "";
        }
}
}