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// Other services

Port 5009: Microsoft Windows Filesystem

Port 5009 is assigned by IANA to winfs (Microsoft Windows Filesystem).

5009

How winfs works

Other services
client:5009winfsresponse client:5009winfsresponse

The client sends a request to port 5009 and the winfs 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 5009 dangerous?

We have no specific security note for port 5009. 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 5009

ServicePortTransportDescriptionReferenceUpdated
winfs 5009 TCP, UDP Microsoft Windows Filesystem - 2006-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 5009, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5009'      # process listening on 5009
sudo lsof -nP -i :5009

macOS

sudo lsof -nP -i :5009

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5009 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5009
netstat -ano | findstr :5009

From another machine

nmap -p 5009 -sV <host>
sudo nmap -sU -p 5009 <host>
nc -zv <host> 5009

Block it in the firewall

sudo ufw deny 5009/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5009" -Direction Inbound -LocalPort 5009 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5009 used for?

Port 5009 is assigned by IANA to winfs (Microsoft Windows Filesystem).

Is port 5009 TCP or UDP?

Port 5009 is registered for TCP and UDP.

Is it safe to open port 5009?

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 5009 is open?

On Linux run "ss -ltnup 'sport = :5009'", on macOS "lsof -nP -i :5009", and on Windows "netstat -ano | findstr :5009" to see the local process. From another machine, "nmap -p 5009 <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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