Unable to connect to database: ReplicaSetNoPrimary Error

[Daniel_Chicchon]

I received the above error after trying to connect to my mongo cluster via nodejs.

Here is my uri string with credentials omitted:
mongodb://username:password@shard.mongodb.net:27017,shard.mongodb.net:27017,shard.mongodb.net:27017/admin?ssl=true&replicaSet=atlas-shard0&readPreference=primary&connectTimeoutMS=10000&authSource=admin&authMechanism=SCRAM-SHA-1

I also tested this when whitelisting all IP addresses and still getting the error. What am i doing wrong here?

[santhosh_h1 (Santhosh H)]

were you able to find any solution

[santhosh_h1 (Santhosh H)]

@Stennie_X can you please help on this issue?

[santhosh_h1 (Santhosh H)]

@Stennie_X @Piti.Champeethong can you help on this… i’m working on mongoose with lambda function it would work first time but after sometime would get this error?

[Stennie_X (Stennie)]

Welcome to the MongoDB Community @santhosh_h1 !

Please share more details about your environment:

• version of Mongoose
• version of MongoDB Node.js driver
• description of how your issue manifests

You may find this tutorial a helpful reference: Write A Serverless Function with AWS Lambda and MongoDB | MongoDB

If your Lambda function works for a while and eventually runs into a connection error, I think this suggests you may have cached a stale connection and perhaps need some retry logic.

Regards,
Stennie

[santhosh_h1 (Santhosh H)]

@Stennie_X

• version of Mongoose : 6.1.4
• version of MongoDB Node.js driver 4.2.2
• description of how your issue manifests: lambda function runs fine by connecting to the mongodb atlas server suddenly after a week or something it will throw the above error. after throwing error sometime it will work fine sometime continuously throw above error.

this is my connection code used

                let conn = null;

// module.exports = conn;
exports.connect = async function connect(url = MONGO_URL) {
	try {
		if (conn == null) {
			conn = mongoose
				.connect(url, {
					serverSelectionTimeoutMS: 30000,
				})
				.then(() => mongoose);
			await conn;
			console.log('mongodb connected successfully');
		} else {
			console.log('reused the connection');
		}

		return conn;
	} catch (e) {
		console.error(e);
	}
};

sorry for the delayed response

[Rasool_Khan]

Hey @santhosh_h1 did you find a solution? Facing same issue since a couple of days!
Thanks

[santhosh_h1 (Santhosh H)]

I have not got any solution

[francisco_Innocenti]

hey there? any solution?