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// Other services

Port 2889: RSOM

Port 2889 is assigned by IANA to rsom (RSOM).

2889

How rsom works

Other services
client:2889rsomresponse client:2889rsomresponse

The client sends a request to port 2889 and the rsom 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 2889 dangerous?

We have no specific security note for port 2889. 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 2889

ServicePortTransportDescriptionReferenceUpdated
rsom 2889 TCP, UDP RSOM - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2889, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2889'      # process listening on 2889
sudo lsof -nP -i :2889

macOS

sudo lsof -nP -i :2889

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2889 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2889
netstat -ano | findstr :2889

From another machine

nmap -p 2889 -sV <host>
sudo nmap -sU -p 2889 <host>
nc -zv <host> 2889

Block it in the firewall

sudo ufw deny 2889/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2889" -Direction Inbound -LocalPort 2889 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2889 used for?

Port 2889 is assigned by IANA to rsom (RSOM).

Is port 2889 TCP or UDP?

Port 2889 is registered for TCP and UDP.

Is it safe to open port 2889?

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 2889 is open?

On Linux run "ss -ltnup 'sport = :2889'", on macOS "lsof -nP -i :2889", and on Windows "netstat -ano | findstr :2889" to see the local process. From another machine, "nmap -p 2889 <host>" shows whether it is reachable.

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