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// Other services

Port 1933: IBM LM MT Agent

Port 1933 is assigned by IANA to xmapi (IBM LM MT Agent).

1933

How xmapi works

Other services
client:1933xmapiresponse client:1933xmapiresponse

The client sends a request to port 1933 and the xmapi 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 1933 dangerous?

We have no specific security note for port 1933. 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 1933

ServicePortTransportDescriptionReferenceUpdated
xmapi 1933 TCP, UDP IBM LM MT Agent - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1933, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1933'      # process listening on 1933
sudo lsof -nP -i :1933

macOS

sudo lsof -nP -i :1933

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1933 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1933
netstat -ano | findstr :1933

From another machine

nmap -p 1933 -sV <host>
sudo nmap -sU -p 1933 <host>
nc -zv <host> 1933

Block it in the firewall

sudo ufw deny 1933/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1933" -Direction Inbound -LocalPort 1933 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1933 used for?

Port 1933 is assigned by IANA to xmapi (IBM LM MT Agent).

Is port 1933 TCP or UDP?

Port 1933 is registered for TCP and UDP.

Is it safe to open port 1933?

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 1933 is open?

On Linux run "ss -ltnup 'sport = :1933'", on macOS "lsof -nP -i :1933", and on Windows "netstat -ano | findstr :1933" to see the local process. From another machine, "nmap -p 1933 <host>" shows whether it is reachable.

05 Related
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