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// DevOps, cloud & containers

Port 10933: Listen port used by the Octopus Deploy Tentacle deployment agent

Port 10933 is assigned by IANA to octopustentacle (Listen port used by the Octopus Deploy Tentacle deployment agent).

10933

How octopustentacle works

DevOps, cloud & containers
adminhostoctopustentacle adminhostoctopustentacle

Commands sent to port 10933 create and control containers or cluster resources on the host.

Transport
TCP
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 10933 dangerous?

We have no specific security note for port 10933. 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 10933

ServicePortTransportDescriptionReferenceUpdated
octopustentacle 10933 TCP Listen port used by the Octopus Deploy Tentacle deployment agent - 2015-01-28
-10933-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 10933, and is it reachable?

Linux

sudo ss -ltnup 'sport = :10933'      # process listening on 10933
sudo lsof -nP -i :10933

macOS

sudo lsof -nP -i :10933

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 10933 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 10933
netstat -ano | findstr :10933

From another machine

nmap -p 10933 -sV <host>
nc -zv <host> 10933

Block it in the firewall

sudo ufw deny 10933/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 10933" -Direction Inbound -LocalPort 10933 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 10933 used for?

Port 10933 is assigned by IANA to octopustentacle (Listen port used by the Octopus Deploy Tentacle deployment agent).

Is port 10933 TCP or UDP?

Port 10933 is registered for TCP.

Is it safe to open port 10933?

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 10933 is open?

On Linux run "ss -ltnup 'sport = :10933'", on macOS "lsof -nP -i :10933", and on Windows "netstat -ano | findstr :10933" to see the local process. From another machine, "nmap -p 10933 <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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