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// Other services

Port 17223: ISA100 GCI is a service utilizing a common interface between an ISA100 Wireless gateway and a client application

Port 17223 is assigned by IANA to isa100-gci (ISA100 GCI is a service utilizing a common interface between an ISA100 Wireless gateway and a client application).

17223

How isa100-gci works

Other services
client:17223isa100-gciresponse client:17223isa100-gciresponse

The client sends a request to port 17223 and the isa100-gci service answers.

Transport
TCP
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 17223 dangerous?

We have no specific security note for port 17223. 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 17223

ServicePortTransportDescriptionReferenceUpdated
isa100-gci 17223 TCP ISA100 GCI is a service utilizing a common interface between an ISA100 Wireless gateway and a client application - 2015-07-24
-17223-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 17223, and is it reachable?

Linux

sudo ss -ltnup 'sport = :17223'      # process listening on 17223
sudo lsof -nP -i :17223

macOS

sudo lsof -nP -i :17223

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 17223 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 17223
netstat -ano | findstr :17223

From another machine

nmap -p 17223 -sV <host>
nc -zv <host> 17223

Block it in the firewall

sudo ufw deny 17223/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 17223" -Direction Inbound -LocalPort 17223 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 17223 used for?

Port 17223 is assigned by IANA to isa100-gci (ISA100 GCI is a service utilizing a common interface between an ISA100 Wireless gateway and a client application).

Is port 17223 TCP or UDP?

Port 17223 is registered for TCP.

Is it safe to open port 17223?

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 17223 is open?

On Linux run "ss -ltnup 'sport = :17223'", on macOS "lsof -nP -i :17223", and on Windows "netstat -ano | findstr :17223" to see the local process. From another machine, "nmap -p 17223 <host>" shows whether it is reachable.

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