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Port 3066 (netattachsdmp)

IANA assigns port 3066 to netattachsdmp: NETATTACHSDMP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netattachsdmp TCP NETATTACHSDMP Mike Young -
netattachsdmp UDP NETATTACHSDMP Mike Young -

Check what is listening on port 3066

Linux: is anything listening on TCP 3066?
sudo ss -tlnp 'sport = :3066'
Linux: UDP 3066
sudo ss -ulnp 'sport = :3066'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3066
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3066 '
Windows (Command Prompt)
netstat -ano | findstr :3066
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3066 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3066
From Windows
Test-NetConnection HOST -Port 3066
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3066

Block port 3066 in the firewall

ufw
sudo ufw deny 3066/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3066 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3066 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3066' -Direction Inbound -Protocol TCP -LocalPort 3066 -Action Block
ufw
sudo ufw deny 3066/udp
iptables
sudo iptables -A INPUT -p udp --dport 3066 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3066 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3066' -Direction Inbound -Protocol UDP -LocalPort 3066 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.