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// DevOps, cloud & containers

Port 7121: Virtual Prototypes License Manager

Port 7121 is assigned by IANA to virprot-lm (Virtual Prototypes License Manager).

7121

How virprot-lm works

DevOps, cloud & containers
adminhostvirprot-lm adminhostvirprot-lm

Commands sent to port 7121 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 7121 dangerous?

We have no specific security note for port 7121. 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 7121

ServicePortTransportDescriptionReferenceUpdated
virprot-lm 7121 TCP, UDP Virtual Prototypes License Manager - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 7121, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7121'      # process listening on 7121
sudo lsof -nP -i :7121

macOS

sudo lsof -nP -i :7121

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7121 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7121
netstat -ano | findstr :7121

From another machine

nmap -p 7121 -sV <host>
sudo nmap -sU -p 7121 <host>
nc -zv <host> 7121

Block it in the firewall

sudo ufw deny 7121/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7121" -Direction Inbound -LocalPort 7121 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7121 used for?

Port 7121 is assigned by IANA to virprot-lm (Virtual Prototypes License Manager).

Is port 7121 TCP or UDP?

Port 7121 is registered for TCP and UDP.

Is it safe to open port 7121?

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 7121 is open?

On Linux run "ss -ltnup 'sport = :7121'", on macOS "lsof -nP -i :7121", and on Windows "netstat -ano | findstr :7121" to see the local process. From another machine, "nmap -p 7121 <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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