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// Other services

Port 2939: SM-PAS-2

Port 2939 is assigned by IANA to sm-pas-2 (SM-PAS-2).

2939

How sm-pas-2 works

Other services
client:2939sm-pas-2response client:2939sm-pas-2response

The client sends a request to port 2939 and the sm-pas-2 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 2939 dangerous?

We have no specific security note for port 2939. 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 2939

ServicePortTransportDescriptionReferenceUpdated
sm-pas-2 2939 TCP, UDP SM-PAS-2 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2939, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2939'      # process listening on 2939
sudo lsof -nP -i :2939

macOS

sudo lsof -nP -i :2939

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2939 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2939
netstat -ano | findstr :2939

From another machine

nmap -p 2939 -sV <host>
sudo nmap -sU -p 2939 <host>
nc -zv <host> 2939

Block it in the firewall

sudo ufw deny 2939/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2939" -Direction Inbound -LocalPort 2939 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2939 used for?

Port 2939 is assigned by IANA to sm-pas-2 (SM-PAS-2).

Is port 2939 TCP or UDP?

Port 2939 is registered for TCP and UDP.

Is it safe to open port 2939?

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 2939 is open?

On Linux run "ss -ltnup 'sport = :2939'", on macOS "lsof -nP -i :2939", and on Windows "netstat -ano | findstr :2939" to see the local process. From another machine, "nmap -p 2939 <host>" shows whether it is reachable.

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