Port 2376 · Docker Daemon (TLS)

Port 2376 is Docker Daemon (TLS), TCP.

Docker daemon REST API over TLS — encrypted with mutual TLS client authentication.

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-2376 protocol tcp port 2376

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application ssl service tcp-2376 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 :2376
• PowerShell Test-NetConnection <host> -Port 2376
• nmap nmap -p 2376 <host>

Related ports

• 2375 Docker Daemon (HTTP)
• 2377 Docker Swarm
• 5000 Docker Registry
• 6443 Kubernetes API Server
• 9200 Elasticsearch HTTP
• 4789 VXLAN

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