When I check the console, it show like the following

Failed to load resource: the server responded with a status of 403 ()
/socket.io/?EIO=3&transport=polling&t=L-PoHUg

The following is my nodebb config.

{
    "url": "https://www.ygnconnect.com",
    "secret": "839fa2da-d222-4d68-94a0-a9e07efe2ef5",
    "database": "mongo",
    "mongo": {
        "host": "127.0.0.1",
        "port": "27017",
        "username": "user",
        "password": "pass",
        "database": "db"
    }
}

And the following is my nginx config

### redirects http requests to https
server {
    listen 80;

    server_name ygnconnect.com www.ygnconnect.com;
    return 301 https://www.ygnconnect.com$request_uri;

    return 302 https://$server_name$request_uri;
}

### the https server
server {
    # listen on ssl, deliver with speedy if possible
    listen 443 ssl http2;
    listen [::]:443 ssl http2;

    server_name ygnconnect.com www.ygnconnect.com;

    if ($host = 'ygnconnect.com' ) {
            rewrite ^ https://www.ygnconnect.com$request_uri;
    }

    # change these paths!
    ssl_certificate /etc/letsencrypt/live/www.ygnconnect.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/www.ygnconnect.com/privkey.pem; # managed by Certbot

    # enables all versions of TLS, but not SSLv2 or 3 which are weak and now deprecated.
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_prefer_server_ciphers on;
    ssl_ciphers 'EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH';

    location ~ /.well-known {
        allow all;
    }

   location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header Host $http_host;
        proxy_set_header X-NginX-Proxy true;

        proxy_pass https://127.0.0.1:4567;
        proxy_redirect off;

        # Socket.IO Support
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

}

Is there any idea why I am in trouble?