Port 27017 (TCP) — MongoDB

MongoDB database server.

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Open MongoDB instances are routinely wiped and ransomed. Enable auth and bind privately.

Check if port 27017 is open

On the server, see what is listening:

sudo ss -tulpn | grep ':27017 '

From another machine, test reachability:

nc -zv your-server.example.com 27017

With UFW (Ubuntu/Debian):

sudo ufw deny 27017

With firewalld (RHEL/AlmaLinux/Rocky):

sudo firewall-cmd --permanent --remove-port=27017/tcp && sudo firewall-cmd --reload