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// DevOps, cloud & containers

Port 6326: Double-Take Virtual Recovery Assistant

Port 6326 is assigned by IANA to dt-vra (Double-Take Virtual Recovery Assistant).

6326

How dt-vra works

DevOps, cloud & containers
adminhostdt-vra adminhostdt-vra

Commands sent to port 6326 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 6326 dangerous?

We have no specific security note for port 6326. 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 6326

ServicePortTransportDescriptionReferenceUpdated
dt-vra 6326 TCP Double-Take Virtual Recovery Assistant - 2019-08-23
-6326-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 6326, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6326'      # process listening on 6326
sudo lsof -nP -i :6326

macOS

sudo lsof -nP -i :6326

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6326 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6326
netstat -ano | findstr :6326

From another machine

nmap -p 6326 -sV <host>
nc -zv <host> 6326

Block it in the firewall

sudo ufw deny 6326/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6326" -Direction Inbound -LocalPort 6326 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6326 used for?

Port 6326 is assigned by IANA to dt-vra (Double-Take Virtual Recovery Assistant).

Is port 6326 TCP or UDP?

Port 6326 is registered for TCP.

Is it safe to open port 6326?

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 6326 is open?

On Linux run "ss -ltnup 'sport = :6326'", on macOS "lsof -nP -i :6326", and on Windows "netstat -ano | findstr :6326" to see the local process. From another machine, "nmap -p 6326 <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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