Error de SSL: cómo usar Nginx con la aplicación Node.js usando Angular y websocket

Question

Me encuentro con un error de SSL al configurar Nginx como proxy inverso para una aplicación Node.js. Esta aplicación usa Angular para ofrecer contenido dinámico y para WebSocket, usamosws. WS funciona correctamente pero cuando intento obtener wss recibo el siguiente error

WebSocket connection to 'wss://cen.abcuae.com:5000/' failed: Error in connection establishment: net::ERR_SSL_PROTOCOL_ERROR.

aquí está la configuración en /etc/nginx/sites-available/default

server {


    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/cen.abcuae.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/cen.abcuae.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot




    server_name cen.abcuae.com;

    location / {
        
                proxy_pass http://0.0.0.0:8080; #whatever port your app runs on
                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;
                proxy_read_timeout 3600; 

}
}
server {
    listen 443;
    listen [::]:443 ssl;

     server_name cen.abcuae.com;
        ssl_certificate /etc/letsencrypt/live/cen.abcuae.com/fullchain.pem; # managed by Certbot
        ssl_certificate_key /etc/letsencrypt/live/cen.abcuae.com/privkey.pem; # managed by Certbot
        include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
        ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by C


    location /websocket {
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
      
      proxy_set_header Host $host;
      proxy_pass https://cen.abcuae.com:5000;
      proxy_http_version 1.1;
      proxy_set_header Upgrade $http_upgrade;
      proxy_set_header Connection "upgrade";
    }
}

El error ocurre en el lado del cliente al intentar conectarse al servidor WebSocket

Error en la conexión de WebSocket a 'wss://cen.abcuae.com::5000/': Error al establecer la conexión: net::ERR_SSL_PROTOCOL_ERROR

aquí está mi código de interfaz

import { WebsocketService } from "./websocket.service";

const CHAT_URL = "wss://cen.abcuae.com:5000";