Error! MongoNetworkError: failed to connect to server - after connect to another wifi network

I created an entire, working application with backend in Node.js and Mongodb (Mean stack). Everything is fine, but when I connect to another wifi network there is an error. Please help me. If I have to send more code from the app, write it.

Error! MongoNetworkError: failed to connect to server [eventsdb-shard-00-00-ydx5k.mongodb.net:27017] on first connect [MongoNetworkError: connection 5 to eventsdb-shard-00-00-ydx5k.mongodb.net:27017 closed
    at TLSSocket.<anonymous> 
    at Object.onceWrapper (events.js:300:26)
    at TLSSocket.emit (events.js:210:5)
    at net.js:659:12
    at TCP.done (_tls_wrap.js:481:7) {
  name: 'MongoNetworkError',
  [Symbol(mongoErrorContextSymbol)]: {}
}]

...\App\server\node_modules\mongodb\lib\core\connection\connection.js:372:9 :

function closeHandler(conn) {
  return function(hadError) {
    if (connectionAccounting) deleteConnection(conn.id);

    if (conn.logger.isDebug()) {
      conn.logger.debug(`connection ${conn.id} with for [${conn.address}] closed`);
    }

    if (!hadError) {
      conn.emit(
        'close',
        new MongoNetworkError(`connection ${conn.id} to ${conn.address} closed`), // <------ 372
        conn
      );
    }
  };
}

I solved my problem. On the Mongodb website, where I have a database, I entered "Network Access" -> "Add IP Address", I added my new ip address and there was no error.