nginx proxy manager on oracle cloud 502 Bad Gateway

Question

So I have ubuntu with docker-compose instance on oracle cloud

1. container nginx proxy manager

version: "3"
services:
  app:
    image: 'jc21/nginx-proxy-manager:latest'
    restart: unless-stopped
    ports:
      - '80:80' # Public HTTP Port
      - '443:443' # Public HTTPS Port
      - '81:81' # Admin Web Port
    environment:
      DISABLE_IPV6: 'true'
    volumes:
      - ./data:/data
      - ./letsencrypt:/etc/letsencrypt

2nd container website

version: '3'
services:
  app:
    image: 'nginx:latest'
    restart: unless-stopped
    ports:
      - '91:80'
    volumes:
      - ./data:/usr/share/nginx/html

sudo iptables -L INPUT -n --line-numbers Chain INPUT (policy ACCEPT) num target prot opt source destination
1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED 2 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0
3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
4 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp spt:123 5 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22 6 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

nothing heavy! If go by domain its showing "502 Bad Gateway", but by ip:91 its working fine somebody have experience how to solve?

i no have idea what need to do

Thank you for you time!