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Port 12321 (warehouse-sss)

IANA assigns port 12321 to warehouse-sss: Warehouse Monitoring Syst SSS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
warehouse-sss TCP Warehouse Monitoring Syst SSS Craig Steffen -
warehouse-sss UDP Warehouse Monitoring Syst SSS Craig Steffen -

Registry dates for this port: registered 2005-08.

Check what is listening on port 12321

Linux: is anything listening on TCP 12321?
sudo ss -tlnp 'sport = :12321'
Linux: UDP 12321
sudo ss -ulnp 'sport = :12321'
Linux / macOS: which process owns the port
sudo lsof -nP -i :12321
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':12321 '
Windows (Command Prompt)
netstat -ano | findstr :12321
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 12321 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 12321
From Windows
Test-NetConnection HOST -Port 12321
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 12321

Block port 12321 in the firewall

ufw
sudo ufw deny 12321/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 12321 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 12321 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 12321' -Direction Inbound -Protocol TCP -LocalPort 12321 -Action Block
ufw
sudo ufw deny 12321/udp
iptables
sudo iptables -A INPUT -p udp --dport 12321 -j DROP
nftables
sudo nft add rule inet filter input udp dport 12321 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 12321' -Direction Inbound -Protocol UDP -LocalPort 12321 -Action Block

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