Couldn't connect to server 127.0.0.1:27017 connection attempt failed MongoDB

Question

I am working on Ubuntu OS 16.04. I am starting mongodb using commands:: sudo service mongod start and then mongo

It generated this error for m

Answer 1

MAC: For my case I forgot to turn on mongo server locally, so I fixed the issue by firstly open a new tab on terminal then turn on mongodb server like so: -

mongod 

After that just try to open mongo shell again like so: -

mongo 

Finally it worked!