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

Port 3091: 1Ci Server Management

Port 3091 is assigned by IANA to 1ci-smcs (1Ci Server Management).

3091

How 1ci-smcs works

Other services
client:30911ci-smcsresponse client:30911ci-smcsresponse

The client sends a request to port 3091 and the 1ci-smcs 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 3091 dangerous?

We have no specific security note for port 3091. 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 3091

ServicePortTransportDescriptionReferenceUpdated
1ci-smcs 3091 TCP, UDP 1Ci Server Management - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3091, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3091'      # process listening on 3091
sudo lsof -nP -i :3091

macOS

sudo lsof -nP -i :3091

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3091 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3091
netstat -ano | findstr :3091

From another machine

nmap -p 3091 -sV <host>
sudo nmap -sU -p 3091 <host>
nc -zv <host> 3091

Block it in the firewall

sudo ufw deny 3091/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3091" -Direction Inbound -LocalPort 3091 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3091 used for?

Port 3091 is assigned by IANA to 1ci-smcs (1Ci Server Management).

Is port 3091 TCP or UDP?

Port 3091 is registered for TCP and UDP.

Is it safe to open port 3091?

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 3091 is open?

On Linux run "ss -ltnup 'sport = :3091'", on macOS "lsof -nP -i :3091", and on Windows "netstat -ano | findstr :3091" to see the local process. From another machine, "nmap -p 3091 <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