CyberHunter
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// Other services

Port 3957: MQEnterprise Broker

Port 3957 is assigned by IANA to mqe-broker (MQEnterprise Broker).

3957

How mqe-broker works

Other services
client:3957mqe-brokerresponse client:3957mqe-brokerresponse

The client sends a request to port 3957 and the mqe-broker service answers.

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
Other services
01 Security

Is port 3957 dangerous?

We have no specific security note for port 3957. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 3957

ServicePortTransportDescriptionReferenceUpdated
mqe-broker 3957 TCP, UDP MQEnterprise Broker - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3957, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3957'      # process listening on 3957
sudo lsof -nP -i :3957

macOS

sudo lsof -nP -i :3957

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3957 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3957
netstat -ano | findstr :3957

From another machine

nmap -p 3957 -sV <host>
sudo nmap -sU -p 3957 <host>
nc -zv <host> 3957

Block it in the firewall

sudo ufw deny 3957/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3957" -Direction Inbound -LocalPort 3957 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3957 used for?

Port 3957 is assigned by IANA to mqe-broker (MQEnterprise Broker).

Is port 3957 TCP or UDP?

Port 3957 is registered for TCP and UDP.

Is it safe to open port 3957?

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. Close the port if nothing on the host needs it.

How do I check if port 3957 is open?

On Linux run "ss -ltnup 'sport = :3957'", on macOS "lsof -nP -i :3957", and on Windows "netstat -ano | findstr :3957" to see the local process. From another machine, "nmap -p 3957 <host>" shows whether it is reachable.

05 Related
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