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// Other services

Port 1141: User Message Service

Port 1141 is assigned by IANA to mxomss (User Message Service).

1141

How mxomss works

Other services
client:1141mxomssresponse client:1141mxomssresponse

The client sends a request to port 1141 and the mxomss 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 1141 dangerous?

We have no specific security note for port 1141. 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 1141

ServicePortTransportDescriptionReferenceUpdated
mxomss 1141 TCP, UDP User Message Service - 2006-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 1141, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1141'      # process listening on 1141
sudo lsof -nP -i :1141

macOS

sudo lsof -nP -i :1141

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1141 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1141
netstat -ano | findstr :1141

From another machine

nmap -p 1141 -sV <host>
sudo nmap -sU -p 1141 <host>
nc -zv <host> 1141

Block it in the firewall

sudo ufw deny 1141/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1141" -Direction Inbound -LocalPort 1141 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1141 used for?

Port 1141 is assigned by IANA to mxomss (User Message Service).

Is port 1141 TCP or UDP?

Port 1141 is registered for TCP and UDP.

Is it safe to open port 1141?

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 1141 is open?

On Linux run "ss -ltnup 'sport = :1141'", on macOS "lsof -nP -i :1141", and on Windows "netstat -ano | findstr :1141" to see the local process. From another machine, "nmap -p 1141 <host>" shows whether it is reachable.

05 Related
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