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// DevOps, cloud & containers

Port 6600: Microsoft Hyper-V Live Migration

Port 6600 is assigned by IANA to mshvlm (Microsoft Hyper-V Live Migration).

6600

How mshvlm works

DevOps, cloud & containers
adminhostmshvlm adminhostmshvlm

Commands sent to port 6600 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 6600 dangerous?

We have no specific security note for port 6600. 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 6600

ServicePortTransportDescriptionReferenceUpdated
mshvlm 6600 TCP Microsoft Hyper-V Live Migration - 2009-02-03
-6600-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 6600, and is it reachable?

Linux

sudo ss -ltnup 'sport = :6600'      # process listening on 6600
sudo lsof -nP -i :6600

macOS

sudo lsof -nP -i :6600

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 6600 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 6600
netstat -ano | findstr :6600

From another machine

nmap -p 6600 -sV <host>
nc -zv <host> 6600

Block it in the firewall

sudo ufw deny 6600/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 6600" -Direction Inbound -LocalPort 6600 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 6600 used for?

Port 6600 is assigned by IANA to mshvlm (Microsoft Hyper-V Live Migration).

Is port 6600 TCP or UDP?

Port 6600 is registered for TCP.

Is it safe to open port 6600?

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 6600 is open?

On Linux run "ss -ltnup 'sport = :6600'", on macOS "lsof -nP -i :6600", and on Windows "netstat -ano | findstr :6600" to see the local process. From another machine, "nmap -p 6600 <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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