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// Other services

Port 4125: Opsview Envoy

Port 4125 is assigned by IANA to opsview-envoy (Opsview Envoy).

4125

How opsview-envoy works

Other services
client:4125opsview-envoyresponse client:4125opsview-envoyresponse

The client sends a request to port 4125 and the opsview-envoy 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 4125 dangerous?

We have no specific security note for port 4125. 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 4125

ServicePortTransportDescriptionReferenceUpdated
opsview-envoy 4125 TCP, UDP Opsview Envoy - 2008-09-26

// source: IANA service name and port number registry

03 Check it

Which program uses port 4125, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4125'      # process listening on 4125
sudo lsof -nP -i :4125

macOS

sudo lsof -nP -i :4125

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4125 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4125
netstat -ano | findstr :4125

From another machine

nmap -p 4125 -sV <host>
sudo nmap -sU -p 4125 <host>
nc -zv <host> 4125

Block it in the firewall

sudo ufw deny 4125/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4125" -Direction Inbound -LocalPort 4125 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4125 used for?

Port 4125 is assigned by IANA to opsview-envoy (Opsview Envoy).

Is port 4125 TCP or UDP?

Port 4125 is registered for TCP and UDP.

Is it safe to open port 4125?

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 4125 is open?

On Linux run "ss -ltnup 'sport = :4125'", on macOS "lsof -nP -i :4125", and on Windows "netstat -ano | findstr :4125" to see the local process. From another machine, "nmap -p 4125 <host>" shows whether it is reachable.

05 Related
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