CyberHunter
Local dataset, no network
// Messaging & queues

Port 5673: JACL Message Server

Port 5673 is assigned by IANA to jms (JACL Message Server).

5673

How jms works

Messaging & queues
producerconsumerqueuejms producerconsumerqueuejms

Producers publish messages into a queue on port 5673; consumers pick them up in order, at their own pace.

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
Messaging & queues
01 Security

Is port 5673 dangerous?

We have no specific security note for port 5673. Its risk depends on the program actually listening on it. General advice for messaging & queues services:

  • Require authentication and TLS on brokers and coordination services.
  • Restrict clients by network and per-topic or per-queue permissions.
  • Remove default accounts.
02 Registry

IANA registry entries for port 5673

ServicePortTransportDescriptionReferenceUpdated
jms 5673 TCP, UDP JACL Message Server - 2002-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 5673, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5673'      # process listening on 5673
sudo lsof -nP -i :5673

macOS

sudo lsof -nP -i :5673

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5673 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5673
netstat -ano | findstr :5673

From another machine

nmap -p 5673 -sV <host>
sudo nmap -sU -p 5673 <host>
nc -zv <host> 5673

Block it in the firewall

sudo ufw deny 5673/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5673" -Direction Inbound -LocalPort 5673 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5673 used for?

Port 5673 is assigned by IANA to jms (JACL Message Server).

Is port 5673 TCP or UDP?

Port 5673 is registered for TCP and UDP.

Is it safe to open port 5673?

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. Require authentication and TLS on brokers and coordination services.

How do I check if port 5673 is open?

On Linux run "ss -ltnup 'sport = :5673'", on macOS "lsof -nP -i :5673", and on Windows "netstat -ano | findstr :5673" to see the local process. From another machine, "nmap -p 5673 <host>" shows whether it is reachable.

05 Related
:5672 AMQP (RabbitMQ) tcp · udp · sctp · high risk :9092 Apache Kafka tcp · udp · high risk :2181 ZooKeeper tcp · udp · high risk :15672 RabbitMQ management tcp · high risk :1881 IBM WebSphere MQ Everyplace tcp · udp :2230 MetaSoft Job Queue Administration Service tcp · udp :2664 Patrol for MQ GM tcp · udp :2665 Patrol for MQ NM tcp · udp

Latest vulnerability news

All news