Mongodb: failed to connect to server on first connect

Question

I get the following error:

Warning { MongoError: failed to connect to server [mongodb:27017] on first connect
    at Pool. (/Users/michaelks         


        

Answer 1

I was running mongod in a PowerShell instance. I was not getting any output in the powershell console from mongod. I clicked on the PowerShell instance where mongod was running, hit enter and and execution resumed. I am not sure what caused the execution to halt, but I can connect to this instance of mongo immediately now.

Answer 2

I was trying to connect mlab with my company wifi connection and it was giving this error. But when I switched to personal network it worked and got connected.

Answer 3

if it is cluster MongoDB then you need to add your current IP to the cluster, to add your current IP address you need to complete few steps below-

step 1- go to login page of Mongodb and login with valid credential - https://cloud.mongodb.com/user#/atlas/login
step 2- CLick Network Access from left sidebar under Security Section
Step 3 - Click Add IP Address
Step 4 - Click Add Current IP Address or Allow Connection From Any Where
now try to connect - npm start

and for Local MongoDB use mongo String like "mongodb+srv://username:pass%40ord@clastername-blqnk.mongodb.net/test?retryWrites=true&w=majority"

password must be encoded like example string

Answer 4

Adding one more answer as the solution is from different contexts:

MongoDb Atlas problem solution

I connected to MongoDB Atlas and whitelisted my machine's IP by following the below steps:

• Go to the security tab

• Go to the network access tab under the security tab

• Go to the IP whitelist tab

• Enter the IP address of your machine

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Answer 5

To connect to mongodb with mongoose, you can use :

mongoose.connect('mongodb://localhost/users_test');

or

mongoose.connect('localhost/users_test');

or

mongoose.connect('localhost','users_test');

But not mongoose.connect('mongodb:localhost/users_test');, it doesnt match the right hostname (mongodb instead of localhost)

Answer 6

While connected to a wifi network, mongodb://localhost/db_name worked as expected.

When I wasn't connected to any wifi network, this couldn't work. Instead I used, mongodb://127.0.0.1/db_name and it worked.

Probably a problem to do with ip configurations.