I am coming from riak and redis where I never had an issue with this services starting, or to interact.
This is a pervasive problem with mongo and am rather clueless
In my case:
First I open config file
sudo vi /etc/mongodb.conf
Comment IP and Port like this
#bind_ip = 127.0.0.1
#port = 27017
Then restart mongodb
sudo service mongodb restart
sudo service mongod restart
Finally, it's work :D
finn@Finn ~ $ mongo
MongoDB shell version: 2.4.9
connecting to: test
> exit