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// Other services

Port 12002: IBM Enterprise Extender SNA COS High Priority

Port 12002 is assigned by IANA to entexthigh (IBM Enterprise Extender SNA COS High Priority).

12002

How entexthigh works

Other services
client:12002entexthighresponse client:12002entexthighresponse

The client sends a request to port 12002 and the entexthigh 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 12002 dangerous?

We have no specific security note for port 12002. 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 12002

ServicePortTransportDescriptionReferenceUpdated
entexthigh 12002 TCP, UDP IBM Enterprise Extender SNA COS High Priority - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 12002, and is it reachable?

Linux

sudo ss -ltnup 'sport = :12002'      # process listening on 12002
sudo lsof -nP -i :12002

macOS

sudo lsof -nP -i :12002

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 12002 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 12002
netstat -ano | findstr :12002

From another machine

nmap -p 12002 -sV <host>
sudo nmap -sU -p 12002 <host>
nc -zv <host> 12002

Block it in the firewall

sudo ufw deny 12002/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 12002" -Direction Inbound -LocalPort 12002 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 12002 used for?

Port 12002 is assigned by IANA to entexthigh (IBM Enterprise Extender SNA COS High Priority).

Is port 12002 TCP or UDP?

Port 12002 is registered for TCP and UDP.

Is it safe to open port 12002?

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 12002 is open?

On Linux run "ss -ltnup 'sport = :12002'", on macOS "lsof -nP -i :12002", and on Windows "netstat -ano | findstr :12002" to see the local process. From another machine, "nmap -p 12002 <host>" shows whether it is reachable.

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