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// DevOps, cloud & containers

Port 5028: Quiqum Virtual Relais

Port 5028 is assigned by IANA to qvr (Quiqum Virtual Relais).

5028

How qvr works

DevOps, cloud & containers
adminhostqvr adminhostqvr

Commands sent to port 5028 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 5028 dangerous?

We have no specific security note for port 5028. 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 5028

ServicePortTransportDescriptionReferenceUpdated
qvr 5028 TCP Quiqum Virtual Relais - 2009-07-06
-5028-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5028, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5028'      # process listening on 5028
sudo lsof -nP -i :5028

macOS

sudo lsof -nP -i :5028

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5028 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5028
netstat -ano | findstr :5028

From another machine

nmap -p 5028 -sV <host>
nc -zv <host> 5028

Block it in the firewall

sudo ufw deny 5028/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5028" -Direction Inbound -LocalPort 5028 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5028 used for?

Port 5028 is assigned by IANA to qvr (Quiqum Virtual Relais).

Is port 5028 TCP or UDP?

Port 5028 is registered for TCP.

Is it safe to open port 5028?

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 5028 is open?

On Linux run "ss -ltnup 'sport = :5028'", on macOS "lsof -nP -i :5028", and on Windows "netstat -ano | findstr :5028" to see the local process. From another machine, "nmap -p 5028 <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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