CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Other services

Port 1617: Nimrod Inter-Agent Communication

Port 1617 is assigned by IANA to nimrod-agent (Nimrod Inter-Agent Communication).

1617

How nimrod-agent works

Other services
client:1617nimrod-agentresponse client:1617nimrod-agentresponse

The client sends a request to port 1617 and the nimrod-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 1617 dangerous?

We have no specific security note for port 1617. 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 1617

ServicePortTransportDescriptionReferenceUpdated
nimrod-agent 1617 TCP, UDP Nimrod Inter-Agent Communication - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1617, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1617'      # process listening on 1617
sudo lsof -nP -i :1617

macOS

sudo lsof -nP -i :1617

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1617 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1617
netstat -ano | findstr :1617

From another machine

nmap -p 1617 -sV <host>
sudo nmap -sU -p 1617 <host>
nc -zv <host> 1617

Block it in the firewall

sudo ufw deny 1617/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1617" -Direction Inbound -LocalPort 1617 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1617 used for?

Port 1617 is assigned by IANA to nimrod-agent (Nimrod Inter-Agent Communication).

Is port 1617 TCP or UDP?

Port 1617 is registered for TCP and UDP.

Is it safe to open port 1617?

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 1617 is open?

On Linux run "ss -ltnup 'sport = :1617'", on macOS "lsof -nP -i :1617", and on Windows "netstat -ano | findstr :1617" to see the local process. From another machine, "nmap -p 1617 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news