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// Monitoring & logging

Port 2660: GC Monitor

Port 2660 is assigned by IANA to gcmonitor (GC Monitor).

2660

How gcmonitor works

Monitoring & logging
monitoringdevicegcmonitor monitoringdevicegcmonitor

The monitoring server collects metrics, alerts or logs from devices over port 2660.

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 2660 dangerous?

We have no specific security note for port 2660. 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 2660

ServicePortTransportDescriptionReferenceUpdated
gcmonitor 2660 TCP, UDP GC Monitor - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2660, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2660'      # process listening on 2660
sudo lsof -nP -i :2660

macOS

sudo lsof -nP -i :2660

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2660 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2660
netstat -ano | findstr :2660

From another machine

nmap -p 2660 -sV <host>
sudo nmap -sU -p 2660 <host>
nc -zv <host> 2660

Block it in the firewall

sudo ufw deny 2660/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2660" -Direction Inbound -LocalPort 2660 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2660 used for?

Port 2660 is assigned by IANA to gcmonitor (GC Monitor).

Is port 2660 TCP or UDP?

Port 2660 is registered for TCP and UDP.

Is it safe to open port 2660?

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 2660 is open?

On Linux run "ss -ltnup 'sport = :2660'", on macOS "lsof -nP -i :2660", and on Windows "netstat -ano | findstr :2660" to see the local process. From another machine, "nmap -p 2660 <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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