mongoose connection throwing MongooseServerSelectionError

Question

I am trying to connect to my mongodb Atlas via the mongoose driver and it keeps throwing a MongooseServerSelectionError, and i have checked my username and password for the database user and it is correct.

Here is my code:

server running on port 3000
we are connected: { MongooseServerSelectionError: connection timed out
    at new MongooseServerSelectionError (/home/ateyib/UCSD-classes/CSE 135/hw3/node_modules/mongoose/lib/error/serverSelection.js:22:11)
    at NativeConnection.Connection.openUri (/home/ateyib/UCSD-classes/CSE 135/hw3/node_modules/mongoose/lib/connection.js:808:32)
    at Mongoose.connect (/home/ateyib/UCSD-classes/CSE 135/hw3/node_modules/mongoose/lib/index.js:333:15)
    at Object.<anonymous> (/home/ateyib/UCSD-classes/CSE 135/hw3/server.js:17:4)
    at Module._compile (internal/modules/cjs/loader.js:738:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:749:10)
    at Module.load (internal/modules/cjs/loader.js:630:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:570:12)
    at Function.Module._load (internal/modules/cjs/loader.js:562:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:801:12)
    at internal/main/run_main_module.js:21:11
  message: 'connection timed out',
  name: 'MongooseServerSelectionError',
  reason:
   TopologyDescription {
     type: 'ReplicaSetNoPrimary',
     setName: 'Cluster0-shard-0',
     maxSetVersion: null,
     maxElectionId: null,
     servers:
      Map {
        'cluster0-shard-00-00-ebets.mongodb.net:27017' => [ServerDescription],
        'cluster0-shard-00-01-ebets.mongodb.net:27017' => [ServerDescription],
        'cluster0-shard-00-02-ebets.mongodb.net:27017' => [ServerDescription] },
     stale: false,
     compatible: true,
     compatibilityError: null,
     logicalSessionTimeoutMinutes: 30,
     heartbeatFrequencyMS: 10000,
     localThresholdMS: 15,
     commonWireVersion: 8 },
  [Symbol(mongoErrorContextSymbol)]: {} }

Answer 1

It is something related to your ip address probably. Go to Network Access toolbar option click on EDIT button and then on ADD CURRENT IP ADDRESS and confirm. This worked for me.

Answer 2

Using Mongo 3.6 and Mongoose 5.9.1 connecting to a replicaSet not on Atlas, setting useUnifiedTopology to true caused my issues. Removing this from my options made it work.

{ useUnifiedTopology: false } or don't set it at all and let it default to false

https://github.com/Automattic/mongoose/issues/8180