CyberHunter
Local dataset, no network
// Other services

Port 5746: fcopys-server

Port 5746 is assigned by IANA to fcopys-server (fcopys-server).

5746

How fcopys-server works

Other services
client:5746fcopys-serverresponse client:5746fcopys-serverresponse

The client sends a request to port 5746 and the fcopys-server 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 5746 dangerous?

We have no specific security note for port 5746. 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 5746

ServicePortTransportDescriptionReferenceUpdated
fcopys-server 5746 TCP, UDP fcopys-server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5746, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5746'      # process listening on 5746
sudo lsof -nP -i :5746

macOS

sudo lsof -nP -i :5746

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5746 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5746
netstat -ano | findstr :5746

From another machine

nmap -p 5746 -sV <host>
sudo nmap -sU -p 5746 <host>
nc -zv <host> 5746

Block it in the firewall

sudo ufw deny 5746/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5746" -Direction Inbound -LocalPort 5746 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5746 used for?

Port 5746 is assigned by IANA to fcopys-server (fcopys-server).

Is port 5746 TCP or UDP?

Port 5746 is registered for TCP and UDP.

Is it safe to open port 5746?

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 5746 is open?

On Linux run "ss -ltnup 'sport = :5746'", on macOS "lsof -nP -i :5746", and on Windows "netstat -ano | findstr :5746" to see the local process. From another machine, "nmap -p 5746 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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