Не работает dokku. как исправить?

Question

[shardik_rus]

приложение на базе angular 4 работало до того момента, когда faspanel самопроизвольно переписала конфиги nginx (в частности ssl.conf), что привело к правкам. теперь приложение не работает.
из логов:

2020/02/05 16:16:10 [error] 11350#11350: *128 connect() failed (111: Connection refused) while connecting to upstream, client: 51.254.18.52, server: ***.ru, request: "GET /favicon.ico HTTP/1.1", upstream: "http://172.17.0.6:5000/favicon.ico", host: "***.ru", referrer: "http://***.ru/"

конфиг nginx для приложения:

server {
  listen      [::]:80;
  listen      80;
  server_name ***.ru; 
  access_log  /var/log/nginx/nearme-access.log;
  error_log   /var/log/nginx/nearme-error.log;

  location    / {

    gzip on;
    gzip_min_length  1100;
    gzip_buffers  4 32k;
    gzip_types    text/css text/javascript text/xml text/plain text/x-component application/javascript application/x-javascript application/json application/xml  application/rss+xml font/truetype application/x-font-ttf font/opentype application/vnd.ms-fontobject image/svg+xml;
    gzip_vary on;
    gzip_comp_level  6;

    proxy_pass  http://nearme-5000;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection $http_connection;
    proxy_set_header Host $http_host;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Forwarded-For $remote_addr;
    proxy_set_header X-Forwarded-Port $server_port;
    proxy_set_header X-Request-Start $msec;
  }
  include /home/dokku/nearme/nginx.conf.d/*.conf;

  error_page 400 401 402 403 405 406 407 408 409 410 411 412 413 414 415 416 417 418 420 422 423 424 426 428 429 431 444 449 450 451 /400-error.html;
  location /400-error.html {
    root /var/lib/dokku/data/nginx-vhosts/dokku-errors;
    internal;
  }

  error_page 404 /404-error.html;
  location /404-error.html {
    root /var/lib/dokku/data/nginx-vhosts/dokku-errors;
    internal;
  }

  error_page 500 501 502 503 504 505 506 507 508 509 510 511 /500-error.html;
  location /500-error.html {
    root /var/lib/dokku/data/nginx-vhosts/dokku-errors;
    internal;
  }

}

upstream nearme-5000 {

  server 172.17.0.6:5000;
}

подскажите, где копать? Спасибо!