Port 6443 · Kubernetes API Server

Port 6443 is Kubernetes API Server, TCP.

Kubernetes API server — primary control plane endpoint. All kubectl commands, CI/CD, and internal components talk here.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service tcp-6443 protocol tcp port 6443

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application ssl service tcp-6443 action allow

Risk and exposure

Rated medium risk. Restrict this port to the sources that need it and keep the service patched; avoid exposing it to the whole internet unless the service is meant to be public.

Check it

• Linux ss -tlnp | grep :6443
• PowerShell Test-NetConnection <host> -Port 6443
• nmap nmap -p 6443 <host>

Related ports

• 2379 etcd Client
• 2380 etcd Peer
• 2375 Docker Daemon (HTTP)
• 2376 Docker Daemon (TLS)
• 4789 VXLAN
• 9200 Elasticsearch HTTP

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