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// DevOps, cloud & containers

Port 3374: Cluster Disc

Port 3374 is assigned by IANA to cluster-disc (Cluster Disc).

3374

How cluster-disc works

DevOps, cloud & containers
adminhostcluster-disc adminhostcluster-disc

Commands sent to port 3374 create and control containers or cluster resources on the host.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
DevOps, cloud & containers
01 Security

Is port 3374 dangerous?

We have no specific security note for port 3374. Its risk depends on the program actually listening on it. General advice for devops, cloud & containers services:

  • Container and orchestration APIs give full control of hosts: require mutual TLS and RBAC.
  • Never expose them to the Internet.
  • Rotate tokens and certificates and audit who has access.
02 Registry

IANA registry entries for port 3374

ServicePortTransportDescriptionReferenceUpdated
cluster-disc 3374 TCP, UDP Cluster Disc - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3374, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3374'      # process listening on 3374
sudo lsof -nP -i :3374

macOS

sudo lsof -nP -i :3374

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3374 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3374
netstat -ano | findstr :3374

From another machine

nmap -p 3374 -sV <host>
sudo nmap -sU -p 3374 <host>
nc -zv <host> 3374

Block it in the firewall

sudo ufw deny 3374/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3374" -Direction Inbound -LocalPort 3374 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3374 used for?

Port 3374 is assigned by IANA to cluster-disc (Cluster Disc).

Is port 3374 TCP or UDP?

Port 3374 is registered for TCP and UDP.

Is it safe to open port 3374?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Container and orchestration APIs give full control of hosts: require mutual TLS and RBAC.

How do I check if port 3374 is open?

On Linux run "ss -ltnup 'sport = :3374'", on macOS "lsof -nP -i :3374", and on Windows "netstat -ano | findstr :3374" to see the local process. From another machine, "nmap -p 3374 <host>" shows whether it is reachable.

05 Related
:2375 Docker API (HTTP) tcp · critical risk :2376 Docker API (TLS) tcp · high risk :6443 Kubernetes API tcp · udp · high risk :10250 Kubelet API tcp · critical risk :2379 etcd tcp · critical risk :8500 Consul tcp · udp · high risk :4505 SaltStack tcp · critical risk :9000 PHP-FPM / SonarQube / Portainer tcp · udp · high risk

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