Connection refused to MongoDB errno 111 - linux

Question

I have a Linode server running Ubuntu 12.04 LTS and MongoDB instance (service is running and CAN connect locally) that I can't connect to from an outside source.
I have added these two rules to my IP tables, where < ip address > is the server I want to connect FROM (as outlined in this MongoDB reference):
iptables -A INPUT -s < ip-address > -p tcp --destination-port 27017 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -d < ip-address > -p tcp --source-port 27017 -m state --state ESTABLISHED -j ACCEPT
And I see the rule in my IP table allowing connections on 27017 to and from < ip address > however when I try to connect from , < ip address > to my mongo database using a command like this:
mongo databasedomain/databasename -u username -p password
I get this error:
2014-07-22T23:54:03.093+0000 warning: Failed to connect to databaseserverip:27017, reason: errno:111 Connection refused
2014-07-22T23:54:03.094+0000 Error: couldn't connect to server < ip address >:27017 (databaseserverip), connection attempt failed at src/mongo/shell/mongo.js:148
exception: connect failed
Any help is VERY APPRECIATED!!!! Thanks!!!

Answer 1

Thanks for the help everyone!
Turns out that it was an iptable conflict. Two rules listing the port open (which resulted in a closed port).
However, one of the comments by aka and another by manu2013 were problems that I would have run into, if not for the conflict.
So! Always remember to edit the /etc/mongod.conf file and set your bind_ip = 0.0.0.0 in order to make connections externally.
Also, make sure that you don't have conflicting rules in your iptable for the port mongo wants (see link on mongodb's site to set up your iptables properly).

Answer 2

Try the following:
sudo rm /var/lib/mongodb/mongod.lock
sudo service mongodb restart

Answer 3

These commands fixed the issue for me,
sudo rm /var/lib/mongodb/mongod.lock
sudo mongod --repair
sudo service mongod start
sudo service mongod status
If you are behind proxy, use:-
export http_proxy="http://username:password#company.com:port/"
export https_proxy="http://username:password#company.com:port/"
Reference: https://stackoverflow.com/a/24410282/4359237

Answer 4

For Ubuntu Server 15.04 and 16.04 you need execute only this command
sudo apt-get install --reinstall mongodb

Answer 5

I Didn't have a /data/db directory. I created one and gave a chmod 777 permission and it worked for me

Answer 6

For me, changing the ownership of /var/lib/mongodb and /tmp/mongodb-27017.sock to mongodb was the way to go.
Just do:
sudo chown -R mongodb:mongodb /var/lib/mongodb
and then:
sudo chown mongodb:mongodb /tmp/mongodb-27017.sock
and then start or restart the mongodb server:
sudo systemctl start mongod
or
sudo systemctl restart mongod
and check the status
sudo systemctl status mongod

Answer 7

One other option is to just repair your database like so (note: db0 directory should be pre-created first):
mongod --dbpath /var/lib/mongodb/ --repairpath /var/lib/mongodb/db0
This is also an acceptable option in production environments...

Answer 8

I also had the same issue.Make a directory in dbpath.In my case there wasn't a directory in /data/db .So i created one.Now its working.Make sure to give permission to that directory.

Answer 9

In my case previous version was 3.2. I have upgraded to 3.6 but data files was not compatible to new version so I removed all data files as it was not usable for me and its works.
You can check logs using /var/log/mongodb

Answer 10

I follow this tutorial's instructions for installation
How to Install MongoDB on Ubuntu 16.04
I had the same mistake. Finally, I found out that I needed to set the port number
The default port number for the mongo command is 27017
But the default port number in mongo.conf is 29999

Answer 11

This done the trick for me
sudo service mongod restart

Answer 12

Even though the port is open, MongoDB is currently only listening on the local address 127.0.0.1. To allow remote connections, add your server’s publicly-routable IP address to the mongod.conf file.
Open the MongoDB configuration file in your editor:
sudo nano /etc/mongodb.conf
Add your server’s IP address to the bindIP value:
...
logappend=true
bind_ip = 127.0.0.1,your_server_ip
#port = 27017
...
Note that now everybody who has the username and password can login to your DB and you want to avoid this by restrict the connection only for specific IP's. This can be done using Firewall (read about UFW service at Google). But in short this should be something like this:
sudo ufw allow from YOUR_IP to any port 27017