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// Other services

Port 4458: Matrix Configuration Protocol

Port 4458 is assigned by IANA to mcp (Matrix Configuration Protocol).

4458

How mcp works

Other services
client:4458mcpresponse client:4458mcpresponse

The client sends a request to port 4458 and the mcp 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 4458 dangerous?

We have no specific security note for port 4458. 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 4458

ServicePortTransportDescriptionReferenceUpdated
mcp 4458 TCP, UDP Matrix Configuration Protocol - 2006-12

// source: IANA service name and port number registry

03 Check it

Which program uses port 4458, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4458'      # process listening on 4458
sudo lsof -nP -i :4458

macOS

sudo lsof -nP -i :4458

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4458 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4458
netstat -ano | findstr :4458

From another machine

nmap -p 4458 -sV <host>
sudo nmap -sU -p 4458 <host>
nc -zv <host> 4458

Block it in the firewall

sudo ufw deny 4458/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4458" -Direction Inbound -LocalPort 4458 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4458 used for?

Port 4458 is assigned by IANA to mcp (Matrix Configuration Protocol).

Is port 4458 TCP or UDP?

Port 4458 is registered for TCP and UDP.

Is it safe to open port 4458?

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 4458 is open?

On Linux run "ss -ltnup 'sport = :4458'", on macOS "lsof -nP -i :4458", and on Windows "netstat -ano | findstr :4458" to see the local process. From another machine, "nmap -p 4458 <host>" shows whether it is reachable.

05 Related
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