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// Monitoring & logging

Port 7421: Matisse Port Monitor

Port 7421 is assigned by IANA to mtportmon (Matisse Port Monitor).

7421

How mtportmon works

Monitoring & logging
monitoringdevicemtportmon monitoringdevicemtportmon

The monitoring server collects metrics, alerts or logs from devices over port 7421.

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
Monitoring & logging
01 Security

Is port 7421 dangerous?

We have no specific security note for port 7421. Its risk depends on the program actually listening on it. General advice for monitoring & logging services:

  • Restrict management and monitoring protocols to the monitoring network.
  • Replace community strings and default credentials.
  • Send logs over TLS.
02 Registry

IANA registry entries for port 7421

ServicePortTransportDescriptionReferenceUpdated
mtportmon 7421 TCP, UDP Matisse Port Monitor - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 7421, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7421'      # process listening on 7421
sudo lsof -nP -i :7421

macOS

sudo lsof -nP -i :7421

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7421 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7421
netstat -ano | findstr :7421

From another machine

nmap -p 7421 -sV <host>
sudo nmap -sU -p 7421 <host>
nc -zv <host> 7421

Block it in the firewall

sudo ufw deny 7421/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7421" -Direction Inbound -LocalPort 7421 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7421 used for?

Port 7421 is assigned by IANA to mtportmon (Matisse Port Monitor).

Is port 7421 TCP or UDP?

Port 7421 is registered for TCP and UDP.

Is it safe to open port 7421?

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. Restrict management and monitoring protocols to the monitoring network.

How do I check if port 7421 is open?

On Linux run "ss -ltnup 'sport = :7421'", on macOS "lsof -nP -i :7421", and on Windows "netstat -ano | findstr :7421" to see the local process. From another machine, "nmap -p 7421 <host>" shows whether it is reachable.

05 Related
:161 SNMP udp · tcp · high risk :162 SNMP trap udp · tcp · moderate risk :9090 Prometheus / admin consoles tcp · udp · high risk :514 Syslog udp · tcp · moderate risk :6514 Syslog over TLS tcp · udp · dccp · low risk :5601 Kibana tcp · udp · high risk :391 SynOptics SNMP Relay Port tcp · udp :412 Trap Convention Port tcp · udp

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