HTTPfy

Port 3346 (trnsprntproxy)

IANA assigns port 3346 to trnsprntproxy: Trnsprnt Proxy.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
trnsprntproxy TCP Trnsprnt Proxy Grant Kirby -
trnsprntproxy UDP Trnsprnt Proxy Grant Kirby -

Check what is listening on port 3346

Linux: is anything listening on TCP 3346?
sudo ss -tlnp 'sport = :3346'
Linux: UDP 3346
sudo ss -ulnp 'sport = :3346'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3346
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3346 '
Windows (Command Prompt)
netstat -ano | findstr :3346
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3346 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3346
From Windows
Test-NetConnection HOST -Port 3346
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3346

Block port 3346 in the firewall

ufw
sudo ufw deny 3346/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3346 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3346 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3346' -Direction Inbound -Protocol TCP -LocalPort 3346 -Action Block
ufw
sudo ufw deny 3346/udp
iptables
sudo iptables -A INPUT -p udp --dport 3346 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3346 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3346' -Direction Inbound -Protocol UDP -LocalPort 3346 -Action Block

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