- Patch VPN gateways quickly: they are a top initial access target.
- Use certificates or MFA rather than shared secrets.
- Investigate unexpected tunnels and proxies: they are also attacker tools.
Port 3346: Trnsprnt Proxy
Port 3346 is assigned by IANA to trnsprntproxy (Trnsprnt Proxy).
3346
How trnsprntproxy works
VPN, tunnels & proxiesTraffic is wrapped in a tunnel between the two ends, so the network in between only sees the tunnel.
- Transport
- TCP · UDP
- Exposure risk
- not rated depends on the program listening
- Encryption
- Unknownnot stated by the registry
- IANA status
- Assigned1 registered service
- Range
- Registered (1024-49151)
- Category
- VPN, tunnels & proxies
Is port 3346 dangerous?
We have no specific security note for port 3346. Its risk depends on the program actually listening on it. General advice for vpn, tunnels & proxies services:
IANA registry entries for port 3346
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| trnsprntproxy | 3346 | TCP, UDP | Trnsprnt Proxy | - | - |
// source: IANA service name and port number registry
Which program uses port 3346, and is it reachable?
Linux
sudo ss -ltnup 'sport = :3346' # process listening on 3346
sudo lsof -nP -i :3346macOS
sudo lsof -nP -i :3346
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3346 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 3346 netstat -ano | findstr :3346
From another machine
nmap -p 3346 -sV <host> sudo nmap -sU -p 3346 <host> nc -zv <host> 3346
Block it in the firewall
sudo ufw deny 3346/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 3346" -Direction Inbound -LocalPort 3346 -Protocol TCP -Action Block # Windows
What is port 3346 used for?
Port 3346 is assigned by IANA to trnsprntproxy (Trnsprnt Proxy).
Is port 3346 TCP or UDP?
Port 3346 is registered for TCP and UDP.
Is it safe to open port 3346?
It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Patch VPN gateways quickly: they are a top initial access target.
How do I check if port 3346 is open?
On Linux run "ss -ltnup 'sport = :3346'", on macOS "lsof -nP -i :3346", and on Windows "netstat -ano | findstr :3346" to see the local process. From another machine, "nmap -p 3346 <host>" shows whether it is reachable.