Tuesday, 24 February 2015

MongoDB Correct way to start MongoDB - Error Cannot connect to mongodb errno:61 Connection refused [Solved]

Recently, while involved in full stack Django development and developing an application using Mongodb as database backend, I encountered following error after installing Mongodb on my mac. Ok first, I installed Mongodb by using brew install command:

brew update
brew install mongodb

After installing Mongodb, I tried to access the mongo shell by using mongo command, but I got "Cannot connect to mongodb errno:61 Connection refused error" . Here is the full trace:

alis-air:~ aliraza$ mongo
MongoDB shell version: 2.6.6
connecting to: test
2015-02-24T17:51:36.067+0500 warning: Failed to connect to, reason: errno:61 Connection refused
2015-02-24T17:51:36.069+0500 Error: couldn't connect to server (, connection attempt failed at src/mongo/shell/mongo.js:146
exception: connect failed

I searched for correct ways to start Mongodb on Mac OS. I tried several solutions but the one which worked for me is as follows: In the shell write sudo mongod to start it.

$ mkdir -p /data/db
$ sudo mongod

This started my Mongodb. Next I opened another shell instance (new shell window) and wrote mongo command and it worked without Error Cannot connect to mongodb errno:61 Connection refused! MongoDB starting Problem Solved.

$ mongo
MongoDB shell version: 2.6.6
connecting to: test
Server has startup warnings: 
2015-02-24T18:20:51.384+0500 [initandlisten] 
2015-02-24T18:20:51.384+0500 [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000


  1. Hey, thanks! This was very helpful to me, as I had the same problem on my mac. Maybe you could mention, that the "/data/db" folder has to be placed in the root-directory of the mac even if the "/" at the beginning should determine that. (I placed mine in my project folder at first, it didn't work well - the only logical conclusion was the root-dir.. neverthless..)

    1. I have the same problem, thank you very much!

  2. This comment has been removed by the author.

  3. I encountered the same problem, 'sudo mongod' solved this problem, Thank you!

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