Port 2376 (TCP) — Docker API (TLS)

Docker daemon API with TLS.

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Require client certificates and restrict by IP.

Check if port 2376 is open

On the server, see what is listening:

sudo ss -tulpn | grep ':2376 '

From another machine, test reachability:

nc -zv your-server.example.com 2376

With UFW (Ubuntu/Debian):

sudo ufw deny 2376

With firewalld (RHEL/AlmaLinux/Rocky):

sudo firewall-cmd --permanent --remove-port=2376/tcp && sudo firewall-cmd --reload