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// Other services

Port 2940: SM-PAS-3

Port 2940 is assigned by IANA to sm-pas-3 (SM-PAS-3).

2940

How sm-pas-3 works

Other services
client:2940sm-pas-3response client:2940sm-pas-3response

The client sends a request to port 2940 and the sm-pas-3 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 2940 dangerous?

We have no specific security note for port 2940. 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 2940

ServicePortTransportDescriptionReferenceUpdated
sm-pas-3 2940 TCP, UDP SM-PAS-3 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2940, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2940'      # process listening on 2940
sudo lsof -nP -i :2940

macOS

sudo lsof -nP -i :2940

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2940 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2940
netstat -ano | findstr :2940

From another machine

nmap -p 2940 -sV <host>
sudo nmap -sU -p 2940 <host>
nc -zv <host> 2940

Block it in the firewall

sudo ufw deny 2940/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2940" -Direction Inbound -LocalPort 2940 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2940 used for?

Port 2940 is assigned by IANA to sm-pas-3 (SM-PAS-3).

Is port 2940 TCP or UDP?

Port 2940 is registered for TCP and UDP.

Is it safe to open port 2940?

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 2940 is open?

On Linux run "ss -ltnup 'sport = :2940'", on macOS "lsof -nP -i :2940", and on Windows "netstat -ano | findstr :2940" to see the local process. From another machine, "nmap -p 2940 <host>" shows whether it is reachable.

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