I added a variable reference of MONGO_PRIVATE_URL to one of my other services in the same project with the MongoDB.

However, my backend keeps showing the following error:

raise ServerSelectionTimeoutError(
pymongo.errors.ServerSelectionTimeoutError: mongodb.railway.internal:27017: [Errno -2] Name or service not known (configured timeouts: socketTimeoutMS: 20000.0ms, connectTimeoutMS: 20000.0ms), Timeout: 30s, Topology Description: ]>

I think the url is correctly configured because the error message explicitly states mongodb.railway.internal:27017, however it can't seem to reach the URL.

Project ID: 89fdc23e-198d-43a2-8668-61b5b0306414
Service ID: a83ed6ae-fd71-4dab-b09a-771f7b82a336
Deployment ID: 0a0364b3-c4e4-4ec6-91a2-305a8c8e2162