Port 5000 (TCP) — Flask / Docker registry

Common default for Flask dev server and Docker registry. Also AirPlay on macOS.

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Dev servers are not meant for production exposure.

Check if port 5000 is open

On the server, see what is listening:

sudo ss -tulpn | grep ':5000 '

From another machine, test reachability:

nc -zv your-server.example.com 5000

With UFW (Ubuntu/Debian):

sudo ufw deny 5000

With firewalld (RHEL/AlmaLinux/Rocky):

sudo firewall-cmd --permanent --remove-port=5000/tcp && sudo firewall-cmd --reload