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// Other services

Port 5771: NetAgent

Port 5771 is assigned by IANA to netagent (NetAgent).

5771

How netagent works

Other services
client:5771netagentresponse client:5771netagentresponse

The client sends a request to port 5771 and the netagent 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 5771 dangerous?

We have no specific security note for port 5771. 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 5771

ServicePortTransportDescriptionReferenceUpdated
netagent 5771 TCP, UDP NetAgent - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5771, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5771'      # process listening on 5771
sudo lsof -nP -i :5771

macOS

sudo lsof -nP -i :5771

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5771 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5771
netstat -ano | findstr :5771

From another machine

nmap -p 5771 -sV <host>
sudo nmap -sU -p 5771 <host>
nc -zv <host> 5771

Block it in the firewall

sudo ufw deny 5771/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5771" -Direction Inbound -LocalPort 5771 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5771 used for?

Port 5771 is assigned by IANA to netagent (NetAgent).

Is port 5771 TCP or UDP?

Port 5771 is registered for TCP and UDP.

Is it safe to open port 5771?

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 5771 is open?

On Linux run "ss -ltnup 'sport = :5771'", on macOS "lsof -nP -i :5771", and on Windows "netstat -ano | findstr :5771" to see the local process. From another machine, "nmap -p 5771 <host>" shows whether it is reachable.

05 Related
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