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// Other services

Port 679: MRM

Port 679 is assigned by IANA to mrm (MRM).

679

How mrm works

Other services
client:679mrmresponse client:679mrmresponse

The client sends a request to port 679 and the mrm 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 679 dangerous?

We have no specific security note for port 679. 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 679

ServicePortTransportDescriptionReferenceUpdated
mrm 679 TCP, UDP MRM - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 679, and is it reachable?

Linux

sudo ss -ltnup 'sport = :679'      # process listening on 679
sudo lsof -nP -i :679

macOS

sudo lsof -nP -i :679

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 679 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 679
netstat -ano | findstr :679

From another machine

nmap -p 679 -sV <host>
sudo nmap -sU -p 679 <host>
nc -zv <host> 679

Block it in the firewall

sudo ufw deny 679/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 679" -Direction Inbound -LocalPort 679 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 679 used for?

Port 679 is assigned by IANA to mrm (MRM).

Is port 679 TCP or UDP?

Port 679 is registered for TCP and UDP.

Is it safe to open port 679?

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 679 is open?

On Linux run "ss -ltnup 'sport = :679'", on macOS "lsof -nP -i :679", and on Windows "netstat -ano | findstr :679" to see the local process. From another machine, "nmap -p 679 <host>" shows whether it is reachable.

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