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// Other services

Port 411: Remote MT Protocol

Port 411 is assigned by IANA to rmt (Remote MT Protocol).

411

How rmt works

Other services
client:411rmtresponse client:411rmtresponse

The client sends a request to port 411 and the rmt 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 411 dangerous?

We have no specific security note for port 411. 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 411

ServicePortTransportDescriptionReferenceUpdated
rmt 411 TCP, UDP Remote MT Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 411, and is it reachable?

Linux

sudo ss -ltnup 'sport = :411'      # process listening on 411
sudo lsof -nP -i :411

macOS

sudo lsof -nP -i :411

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 411 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 411
netstat -ano | findstr :411

From another machine

nmap -p 411 -sV <host>
sudo nmap -sU -p 411 <host>
nc -zv <host> 411

Block it in the firewall

sudo ufw deny 411/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 411" -Direction Inbound -LocalPort 411 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 411 used for?

Port 411 is assigned by IANA to rmt (Remote MT Protocol).

Is port 411 TCP or UDP?

Port 411 is registered for TCP and UDP.

Is it safe to open port 411?

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 411 is open?

On Linux run "ss -ltnup 'sport = :411'", on macOS "lsof -nP -i :411", and on Windows "netstat -ano | findstr :411" to see the local process. From another machine, "nmap -p 411 <host>" shows whether it is reachable.

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