MongoServerSelectionError: connection timed out


my Mongo connection seems to time out everyday, after about 7-10 hours of my app running with the error:

MongoServerSelectionError: connection timed out
    at Timeout._onTimeout (/opt/discord/node_modules/mongodb/lib/sdam/topology.js:292:38)
    at listOnTimeout (node:internal/timers:559:17)
    at processTimers (node:internal/timers:502:7) {
  reason: TopologyDescription {
    type: 'ReplicaSetNoPrimary',
    servers: Map(3) {
      '***' => [ServerDescription],
      '***' => [ServerDescription],
      '***' => [ServerDescription]
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    setName: 'atlas-gxcew9-shard-0',
    maxElectionId: new ObjectId("7fffffff0000000000000081"),
    maxSetVersion: 7,
    commonWireVersion: 0,
    logicalSessionTimeoutMinutes: null
  code: undefined,
  [Symbol(errorLabels)]: Set(0) {}

I connect doing:

const url = `mongodb+srv://${environment.mongodb.username}:${environment.mongodb.password}@${}/app_logs?retryWrites=true&keepAlive=true`;
this.client = new MongoClient(url, {
      loggerLevel: LoggerLevel.ERROR,

await this.client.connect();
await this.client.db('app_logs').command({ ping: 1 });

My app runs in a Docker container. I’ve read something about whitelisting the IPs but if I could have some instructions on how to accomplish this with Docker, that’d be very much appreciated.

I’m running Node v16.6.1, Docker 3.8 and Mongo package v4.13.0

Thank you


Same here, did you find out why this happens? it happens to me each 5-7 hours

Hey @Alberto_Oteiza,

Welcome to the MongoDB Community forums :sparkles:

I would recommend creating a new topic with all the deployment details and the specific issue you are facing. This will make it more likely for the community to interact and assist you better.

I also recommend reading Getting Started with the MongoDB Community: README.1ST for some tips to help improve your community outcomes.

Kushagra Kesav