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Port 5009 (winfs)

IANA assigns port 5009 to winfs: Microsoft Windows Filesystem.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
winfs TCP Microsoft Windows Filesystem Simon Skaria -
winfs UDP Microsoft Windows Filesystem Simon Skaria -

Registry dates for this port: registered 2006-01.

Check what is listening on port 5009

Linux: is anything listening on TCP 5009?
sudo ss -tlnp 'sport = :5009'
Linux: UDP 5009
sudo ss -ulnp 'sport = :5009'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5009
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5009 '
Windows (Command Prompt)
netstat -ano | findstr :5009
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5009 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5009
From Windows
Test-NetConnection HOST -Port 5009
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5009

Block port 5009 in the firewall

ufw
sudo ufw deny 5009/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5009 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5009 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5009' -Direction Inbound -Protocol TCP -LocalPort 5009 -Action Block
ufw
sudo ufw deny 5009/udp
iptables
sudo iptables -A INPUT -p udp --dport 5009 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5009 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5009' -Direction Inbound -Protocol UDP -LocalPort 5009 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.