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// Other services

Port 3361: KV Agent

Port 3361 is assigned by IANA to kv-agent (KV Agent).

3361

How kv-agent works

Other services
client:3361kv-agentresponse client:3361kv-agentresponse

The client sends a request to port 3361 and the kv-agent 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 3361 dangerous?

We have no specific security note for port 3361. 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 3361

ServicePortTransportDescriptionReferenceUpdated
kv-agent 3361 TCP, UDP KV Agent - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3361, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3361'      # process listening on 3361
sudo lsof -nP -i :3361

macOS

sudo lsof -nP -i :3361

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3361 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3361
netstat -ano | findstr :3361

From another machine

nmap -p 3361 -sV <host>
sudo nmap -sU -p 3361 <host>
nc -zv <host> 3361

Block it in the firewall

sudo ufw deny 3361/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3361" -Direction Inbound -LocalPort 3361 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3361 used for?

Port 3361 is assigned by IANA to kv-agent (KV Agent).

Is port 3361 TCP or UDP?

Port 3361 is registered for TCP and UDP.

Is it safe to open port 3361?

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 3361 is open?

On Linux run "ss -ltnup 'sport = :3361'", on macOS "lsof -nP -i :3361", and on Windows "netstat -ano | findstr :3361" to see the local process. From another machine, "nmap -p 3361 <host>" shows whether it is reachable.

05 Related
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