Error remote access MongoDB on Ubuntu server

Question

I have an Ubuntu 14.04 Linux server with MongoDB 3.2.4 running at Digital Ocean as a droplet (one-click Apps).

Pinging the server works (droplet is distroyed after posting this):

ping 198.199.125.101

I created database test and user:

db.createUser({"user": "test", "pwd": "test", "roles": ["dbOwner"]})

In mongod.conf I changed bindIp: 0.0.0.0 and restarted mongoDB

I disabled the firewall and reboot the server. Just for test, just to prove iptables is not the issue (don't do this on a regular server):

sudo ufw disable

The problem is I can't get remote access to the mongo Database

mongo 198.199.125.101:27021/test -u "test" -p "test"

Error message (connection refused):

MongoDB shell version: 3.2.0
connecting to: 198.199.125.101:27021/test
2016-05-11T22:05:35.876+0200 W NETWORK  [thread1] Failed to connect to 198.199.125.101:27021, reason: errno:61 Connection refused
2016-05-11T22:05:35.879+0200 E QUERY    [thread1] Error: couldn't connect to server 198.199.125.101:27021, connection attempt failed :
connect@src/mongo/shell/mongo.js:226:14
@(connect):1:6

exception: connect failed

Answer 1

First run netstat on the mongo machine to verify that the port 27021 is open. netstat -anp should do it.

Then do "telnet 127.0.0.1 27021" to make sure it is open.

Once you are sure the port is open, then use telnet 198.199.125.101 27021 to verify you can connect to the mongo machine on port 27021. If you can, then it has something to do with your app. If not then something is blocking the connection. Some firewall or something. Are you on aws?

As per netstat, can you try mongo 198.199.125.101:27017/test -u "test" -p "test"