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Port 3674 (wininstall-ipc)

IANA assigns port 3674 to wininstall-ipc: WinINSTALL IPC Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
wininstall-ipc TCP WinINSTALL IPC Port Bill Somerville -
wininstall-ipc UDP WinINSTALL IPC Port Bill Somerville -

Registry dates for this port: registered 2008-08-13.

Check what is listening on port 3674

Linux: is anything listening on TCP 3674?
sudo ss -tlnp 'sport = :3674'
Linux: UDP 3674
sudo ss -ulnp 'sport = :3674'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3674
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3674 '
Windows (Command Prompt)
netstat -ano | findstr :3674
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3674 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3674
From Windows
Test-NetConnection HOST -Port 3674
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3674

Block port 3674 in the firewall

ufw
sudo ufw deny 3674/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3674 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3674 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3674' -Direction Inbound -Protocol TCP -LocalPort 3674 -Action Block
ufw
sudo ufw deny 3674/udp
iptables
sudo iptables -A INPUT -p udp --dport 3674 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3674 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3674' -Direction Inbound -Protocol UDP -LocalPort 3674 -Action Block

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