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Port 12002 (entexthigh)

IANA assigns port 12002 to entexthigh: IBM Enterprise Extender SNA COS High Priority.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
entexthigh TCP IBM Enterprise Extender SNA COS High Priority Eugene Cox -
entexthigh UDP IBM Enterprise Extender SNA COS High Priority Eugene Cox -

Check what is listening on port 12002

Linux: is anything listening on TCP 12002?
sudo ss -tlnp 'sport = :12002'
Linux: UDP 12002
sudo ss -ulnp 'sport = :12002'
Linux / macOS: which process owns the port
sudo lsof -nP -i :12002
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':12002 '
Windows (Command Prompt)
netstat -ano | findstr :12002
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 12002 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 12002
From Windows
Test-NetConnection HOST -Port 12002
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 12002

Block port 12002 in the firewall

ufw
sudo ufw deny 12002/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 12002 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 12002 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 12002' -Direction Inbound -Protocol TCP -LocalPort 12002 -Action Block
ufw
sudo ufw deny 12002/udp
iptables
sudo iptables -A INPUT -p udp --dport 12002 -j DROP
nftables
sudo nft add rule inet filter input udp dport 12002 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 12002' -Direction Inbound -Protocol UDP -LocalPort 12002 -Action Block

Related ports

12000entextxid12001entextnetwk12003entextmed12004entextlow

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.