Unstable connection to MongoDB via private network

Question

Hi everyone,

Just today my app receives some errors in MongoDB connection, below is the log files (I've attached the screenshot, too):
```
MongoServerSelectionError: getaddrinfo ENOTFOUND mongodb.railway.internal
at Timeout._onTimeout (/app/node_modules/agenda/node_modules/mongodb/lib/sdam/topology.js:292:38)
at listOnTimeout (node:internal/timers:569:17)
at process.processTimers (node:internal/timers:512:7) {
reason: TopologyDescription {
type: 'Unknown',
servers: Map(1) {
'mongodb.railway.internal:27017' => ServerDescription {
address: 'mongodb.railway.internal:27017',
```

It seems that the URL that should have been set for private networking @ `mongodb.railway.internal` could not be recognized by my container running in the same project.

This problem seems to happen intermittently though.

Because my services are live already, I had to switch the MongoDB URL to the public one instead (which would cost me egress network costs).

Please let me know if this is a known issue, or if there is anything else that I should do from my side.

As a dev, aside from reasons based on the costs, I would also prefer the usage of private network to access the DB.

In summary: the private URL access for MongoDB seems to be unstable currently, sometimes the request went thru, sometimes it would just result in a timeout.

Thanks a lot!