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

Question

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
);
}
};
}

Answer 1

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.