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Port 22128 (gsidcap)

IANA assigns port 22128 to gsidcap: GSI dCache Access Protocol.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
gsidcap TCP GSI dCache Access Protocol Christoph Anton Mitt -

Registry dates for this port: registered 2009-03-10.

Check what is listening on port 22128

Linux: is anything listening on TCP 22128?
sudo ss -tlnp 'sport = :22128'
Linux / macOS: which process owns the port
sudo lsof -nP -i :22128
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':22128 '
Windows (Command Prompt)
netstat -ano | findstr :22128
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 22128 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 22128
From Windows
Test-NetConnection HOST -Port 22128

Block port 22128 in the firewall

ufw
sudo ufw deny 22128/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 22128 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 22128 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 22128' -Direction Inbound -Protocol TCP -LocalPort 22128 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.