CyberHunter
Local dataset, no network
// Other services

Port 27442: Job controller service

Port 27442 is assigned by IANA to jesmsjc (Job controller service).

27442

How jesmsjc works

Other services
client:27442jesmsjcresponse client:27442jesmsjcresponse

The client sends a request to port 27442 and the jesmsjc 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 27442 dangerous?

We have no specific security note for port 27442. 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 27442

ServicePortTransportDescriptionReferenceUpdated
jesmsjc 27442 TCP, UDP Job controller service - 2010-10-15

// source: IANA service name and port number registry

03 Check it

Which program uses port 27442, and is it reachable?

Linux

sudo ss -ltnup 'sport = :27442'      # process listening on 27442
sudo lsof -nP -i :27442

macOS

sudo lsof -nP -i :27442

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 27442 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 27442
netstat -ano | findstr :27442

From another machine

nmap -p 27442 -sV <host>
sudo nmap -sU -p 27442 <host>
nc -zv <host> 27442

Block it in the firewall

sudo ufw deny 27442/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 27442" -Direction Inbound -LocalPort 27442 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 27442 used for?

Port 27442 is assigned by IANA to jesmsjc (Job controller service).

Is port 27442 TCP or UDP?

Port 27442 is registered for TCP and UDP.

Is it safe to open port 27442?

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 27442 is open?

On Linux run "ss -ltnup 'sport = :27442'", on macOS "lsof -nP -i :27442", and on Windows "netstat -ano | findstr :27442" to see the local process. From another machine, "nmap -p 27442 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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