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// Other services

Port 1869: TransAct

Port 1869 is assigned by IANA to transact (TransAct).

1869

How transact works

Other services
client:1869transactresponse client:1869transactresponse

The client sends a request to port 1869 and the transact 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 1869 dangerous?

We have no specific security note for port 1869. 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 1869

ServicePortTransportDescriptionReferenceUpdated
transact 1869 TCP, UDP TransAct - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1869, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1869'      # process listening on 1869
sudo lsof -nP -i :1869

macOS

sudo lsof -nP -i :1869

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1869 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1869
netstat -ano | findstr :1869

From another machine

nmap -p 1869 -sV <host>
sudo nmap -sU -p 1869 <host>
nc -zv <host> 1869

Block it in the firewall

sudo ufw deny 1869/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1869" -Direction Inbound -LocalPort 1869 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1869 used for?

Port 1869 is assigned by IANA to transact (TransAct).

Is port 1869 TCP or UDP?

Port 1869 is registered for TCP and UDP.

Is it safe to open port 1869?

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 1869 is open?

On Linux run "ss -ltnup 'sport = :1869'", on macOS "lsof -nP -i :1869", and on Windows "netstat -ano | findstr :1869" to see the local process. From another machine, "nmap -p 1869 <host>" shows whether it is reachable.

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