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// Other services

Port 1066: FPO-FNS

Port 1066 is assigned by IANA to fpo-fns (FPO-FNS).

1066

How fpo-fns works

Other services
client:1066fpo-fnsresponse client:1066fpo-fnsresponse

The client sends a request to port 1066 and the fpo-fns service answers.

Transport
TCP · UDP
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 1066 dangerous?

We have no specific security note for port 1066. 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 1066

ServicePortTransportDescriptionReferenceUpdated
fpo-fns 1066 TCP, UDP FPO-FNS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1066, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1066'      # process listening on 1066
sudo lsof -nP -i :1066

macOS

sudo lsof -nP -i :1066

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1066 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1066
netstat -ano | findstr :1066

From another machine

nmap -p 1066 -sV <host>
sudo nmap -sU -p 1066 <host>
nc -zv <host> 1066

Block it in the firewall

sudo ufw deny 1066/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1066" -Direction Inbound -LocalPort 1066 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1066 used for?

Port 1066 is assigned by IANA to fpo-fns (FPO-FNS).

Is port 1066 TCP or UDP?

Port 1066 is registered for TCP and UDP.

Is it safe to open port 1066?

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 1066 is open?

On Linux run "ss -ltnup 'sport = :1066'", on macOS "lsof -nP -i :1066", and on Windows "netstat -ano | findstr :1066" to see the local process. From another machine, "nmap -p 1066 <host>" shows whether it is reachable.

05 Related
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