无法将流量发送到 nginx 中的端口 3015

Question

我正在尝试在 Debian 上设置 nginx 服务器，以将流量从我的域发送到端口 3015，我正在运行 Node Express 应用程序

这是我的/etc/nginx/sites-available$ sudo vim default

server {

 listen 80;
 server_name transparentecontabilidade.com.br;
 location / {
   proxy_pass http://localhost:3015;
   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;
 }

}

当我运行 etc/nginx/sites-available$ sudo systemctl restart nginx

我明白

Job for nginx.service failed because the control process exited with error code.
See "systemctl status nginx.service" and "journalctl -xe" for details.

当我检查错误时 systemctl status nginx.service

我明白

listen() to 0.0.0.0:
Dec 25 15:26:17 wordpress-1-vm nginx[17448]: nginx: [emerg] listen() to 0.0.0.0:
Dec 25 15:26:18 wordpress-1-vm nginx[17448]: nginx: [emerg] listen() to 0.0.0.0:
Dec 25 15:26:18 wordpress-1-vm nginx[17448]: nginx: [emerg] listen() to 0.0.0.0:
Dec 25 15:26:19 wordpress-1-vm nginx[17448]: nginx: [emerg] listen() to 0.0.0.0:
Dec 25 15:26:19 wordpress-1-vm nginx[17448]: nginx: [emerg] still could not bind
Dec 25 15:26:19 wordpress-1-vm systemd[1]: nginx.service: Control process exited
Dec 25 15:26:19 wordpress-1-vm systemd[1]: Failed to start A high performance we
Dec 25 15:26:19 wordpress-1-vm systemd[1]: nginx.service: Unit entered failed st
Dec 25 15:26:19 wordpress-1-vm systemd[1]: nginx.service: Failed with result 'ex

我该如何解决这个问题？