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Port 1066 (fpo-fns)

IANA assigns port 1066 to fpo-fns: FPO-FNS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
fpo-fns TCP FPO-FNS Jens Klose -
fpo-fns UDP FPO-FNS Jens Klose -

Check what is listening on port 1066

Linux: is anything listening on TCP 1066?
sudo ss -tlnp 'sport = :1066'
Linux: UDP 1066
sudo ss -ulnp 'sport = :1066'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1066
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1066 '
Windows (Command Prompt)
netstat -ano | findstr :1066
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1066 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1066
From Windows
Test-NetConnection HOST -Port 1066
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1066

Block port 1066 in the firewall

ufw
sudo ufw deny 1066/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1066 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1066 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1066' -Direction Inbound -Protocol TCP -LocalPort 1066 -Action Block
ufw
sudo ufw deny 1066/udp
iptables
sudo iptables -A INPUT -p udp --dport 1066 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1066 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1066' -Direction Inbound -Protocol UDP -LocalPort 1066 -Action Block

Related ports

1064jstel1065syscomlan1067instl-boots, instl_boots1068instl-bootc, instl_bootc

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