CyberHunter
Local dataset, no network
// Other services

Port 190: Gateway Access Control Protocol

Port 190 is assigned by IANA to gacp (Gateway Access Control Protocol).

190

How gacp works

Other services
client:190gacpresponse client:190gacpresponse

The client sends a request to port 190 and the gacp 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 190 dangerous?

We have no specific security note for port 190. 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 190

ServicePortTransportDescriptionReferenceUpdated
gacp 190 TCP, UDP Gateway Access Control Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 190, and is it reachable?

Linux

sudo ss -ltnup 'sport = :190'      # process listening on 190
sudo lsof -nP -i :190

macOS

sudo lsof -nP -i :190

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 190 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 190
netstat -ano | findstr :190

From another machine

nmap -p 190 -sV <host>
sudo nmap -sU -p 190 <host>
nc -zv <host> 190

Block it in the firewall

sudo ufw deny 190/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 190" -Direction Inbound -LocalPort 190 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 190 used for?

Port 190 is assigned by IANA to gacp (Gateway Access Control Protocol).

Is port 190 TCP or UDP?

Port 190 is registered for TCP and UDP.

Is it safe to open port 190?

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 190 is open?

On Linux run "ss -ltnup 'sport = :190'", on macOS "lsof -nP -i :190", and on Windows "netstat -ano | findstr :190" to see the local process. From another machine, "nmap -p 190 <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