Port 3000 (TCP) — Dev servers / Grafana

Common default for Node.js dev servers and Grafana.

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Put behind a reverse proxy with TLS and auth.

Check if port 3000 is open

On the server, see what is listening:

sudo ss -tulpn | grep ':3000 '

From another machine, test reachability:

nc -zv your-server.example.com 3000

With UFW (Ubuntu/Debian):

sudo ufw deny 3000

With firewalld (RHEL/AlmaLinux/Rocky):

sudo firewall-cmd --permanent --remove-port=3000/tcp && sudo firewall-cmd --reload