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// Other services

Port 40404: Simplify Printing TX

Port 40404 is assigned by IANA to sptx (Simplify Printing TX).

40404

How sptx works

Other services
client:40404sptxresponse client:40404sptxresponse

The client sends a request to port 40404 and the sptx service answers.

Transport
TCP
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 40404 dangerous?

We have no specific security note for port 40404. 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 40404

ServicePortTransportDescriptionReferenceUpdated
sptx 40404 TCP Simplify Printing TX - 2013-12-09
-40404-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 40404, and is it reachable?

Linux

sudo ss -ltnup 'sport = :40404'      # process listening on 40404
sudo lsof -nP -i :40404

macOS

sudo lsof -nP -i :40404

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 40404 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 40404
netstat -ano | findstr :40404

From another machine

nmap -p 40404 -sV <host>
nc -zv <host> 40404

Block it in the firewall

sudo ufw deny 40404/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 40404" -Direction Inbound -LocalPort 40404 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 40404 used for?

Port 40404 is assigned by IANA to sptx (Simplify Printing TX).

Is port 40404 TCP or UDP?

Port 40404 is registered for TCP.

Is it safe to open port 40404?

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 40404 is open?

On Linux run "ss -ltnup 'sport = :40404'", on macOS "lsof -nP -i :40404", and on Windows "netstat -ano | findstr :40404" to see the local process. From another machine, "nmap -p 40404 <host>" shows whether it is reachable.

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