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Port 534 (windream)

IANA assigns port 534 to windream: windream Admin.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
windream TCP windream Admin Uwe Honermann -
windream UDP windream Admin Uwe Honermann -

Check what is listening on port 534

Linux: is anything listening on TCP 534?
sudo ss -tlnp 'sport = :534'
Linux: UDP 534
sudo ss -ulnp 'sport = :534'
Linux / macOS: which process owns the port
sudo lsof -nP -i :534
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':534 '
Windows (Command Prompt)
netstat -ano | findstr :534
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 534 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 534
From Windows
Test-NetConnection HOST -Port 534
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 534

Block port 534 in the firewall

ufw
sudo ufw deny 534/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 534 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 534 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 534' -Direction Inbound -Protocol TCP -LocalPort 534 -Action Block
ufw
sudo ufw deny 534/udp
iptables
sudo iptables -A INPUT -p udp --dport 534 -j DROP
nftables
sudo nft add rule inet filter input udp dport 534 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 534' -Direction Inbound -Protocol UDP -LocalPort 534 -Action Block

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