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// Other services

Port 22128: GSI dCache Access Protocol

Port 22128 is assigned by IANA to gsidcap (GSI dCache Access Protocol).

22128

How gsidcap works

Other services
client:22128gsidcapresponse client:22128gsidcapresponse

The client sends a request to port 22128 and the gsidcap 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 22128 dangerous?

We have no specific security note for port 22128. 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 22128

ServicePortTransportDescriptionReferenceUpdated
gsidcap 22128 TCP GSI dCache Access Protocol - 2009-03-10
-22128-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 22128, and is it reachable?

Linux

sudo ss -ltnup 'sport = :22128'      # process listening on 22128
sudo lsof -nP -i :22128

macOS

sudo lsof -nP -i :22128

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 22128 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 22128
netstat -ano | findstr :22128

From another machine

nmap -p 22128 -sV <host>
nc -zv <host> 22128

Block it in the firewall

sudo ufw deny 22128/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 22128" -Direction Inbound -LocalPort 22128 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 22128 used for?

Port 22128 is assigned by IANA to gsidcap (GSI dCache Access Protocol).

Is port 22128 TCP or UDP?

Port 22128 is registered for TCP.

Is it safe to open port 22128?

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 22128 is open?

On Linux run "ss -ltnup 'sport = :22128'", on macOS "lsof -nP -i :22128", and on Windows "netstat -ano | findstr :22128" to see the local process. From another machine, "nmap -p 22128 <host>" shows whether it is reachable.

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