How to established MongoDB server connection in MongoDB Compass?

1. Check if MongoDB is Running using below cmd

sudo systemctl status mongod

If MongoDB is not running, start it:

sudo systemctl start mongod

If MongoDB is disabled, enable it:

sudo systemctl enable mongod

2. Verify MongoDB is Listening on the Correct IP

netstat -tulnp | grep mongod
OR
ss -tulnp | grep mongod

It should show:

tcp  LISTEN  0  128  0.0.0.0:27017  0.0.0.0:*  users:(("mongod",pid=1234,fd=11))

If it only shows 127.0.0.1:27017, MongoDB is not allowing remote connections.

Fix: Allow Remote Connections
1.Open MongoDB config file:
sudo nano /etc/mongod.conf
2. Find this line:
bindIp: 127.0.0.1
3.Change it to:

bindIp: 0.0.0.0

4. Save & exit (CTRL + X, then Y, then ENTER).
5. Restart MongoDB:
sudo systemctl restart mongod

3. Open Firewall for MongoDB

sudo ufw allow 27017/tcp
sudo ufw reload

Then check if the firewall is open:

sudo ufw status

Ensure you see:

27017  ALLOW  Anywhere

4. Test Connection from the Server

Try connecting to MongoDB locally from your Ubuntu server:

mongosh
use admin
db.runCommand({ connectionStatus: 1 })

If this works, MongoDB is running fine locally.

5. Use the Correct Connection String in MongoDB Compass

Try connecting with:

mongodb://your ip address:27017

If MongoDB has authentication enabled, use:

mongodb://username:[email protected]:27017/?authSource=admin

Still Not Working?​​​​​​​

Run this on your Ubuntu server and share the output:

sudo ss -tulnp | grep 27017
sudo ufw status
cat /etc/mongod.conf | grep bindIp