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// Other services

Port 441: decvms-sysmgt

Port 441 is assigned by IANA to decvms-sysmgt (decvms-sysmgt).

441

How decvms-sysmgt works

Other services
client:441decvms-sysmgtresponse client:441decvms-sysmgtresponse

The client sends a request to port 441 and the decvms-sysmgt 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 441 dangerous?

We have no specific security note for port 441. 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 441

ServicePortTransportDescriptionReferenceUpdated
decvms-sysmgt 441 TCP, UDP decvms-sysmgt - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 441, and is it reachable?

Linux

sudo ss -ltnup 'sport = :441'      # process listening on 441
sudo lsof -nP -i :441

macOS

sudo lsof -nP -i :441

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 441 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 441
netstat -ano | findstr :441

From another machine

nmap -p 441 -sV <host>
sudo nmap -sU -p 441 <host>
nc -zv <host> 441

Block it in the firewall

sudo ufw deny 441/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 441" -Direction Inbound -LocalPort 441 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 441 used for?

Port 441 is assigned by IANA to decvms-sysmgt (decvms-sysmgt).

Is port 441 TCP or UDP?

Port 441 is registered for TCP and UDP.

Is it safe to open port 441?

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 441 is open?

On Linux run "ss -ltnup 'sport = :441'", on macOS "lsof -nP -i :441", and on Windows "netstat -ano | findstr :441" to see the local process. From another machine, "nmap -p 441 <host>" shows whether it is reachable.

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