- 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 3845: V-ONE Single Port Proxy
Port 3845 is assigned by IANA to v-one-spp (V-ONE Single Port Proxy).
3845
How v-one-spp 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 3845 dangerous?
We have no specific security note for port 3845. Its risk depends on the program actually listening on it. General advice for vpn, tunnels & proxies services:
IANA registry entries for port 3845
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| v-one-spp | 3845 | TCP, UDP | V-ONE Single Port Proxy | - | - |
// source: IANA service name and port number registry
Which program uses port 3845, and is it reachable?
Linux
sudo ss -ltnup 'sport = :3845' # process listening on 3845
sudo lsof -nP -i :3845macOS
sudo lsof -nP -i :3845
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3845 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 3845 netstat -ano | findstr :3845
From another machine
nmap -p 3845 -sV <host> sudo nmap -sU -p 3845 <host> nc -zv <host> 3845
Block it in the firewall
sudo ufw deny 3845/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 3845" -Direction Inbound -LocalPort 3845 -Protocol TCP -Action Block # Windows
What is port 3845 used for?
Port 3845 is assigned by IANA to v-one-spp (V-ONE Single Port Proxy).
Is port 3845 TCP or UDP?
Port 3845 is registered for TCP and UDP.
Is it safe to open port 3845?
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 3845 is open?
On Linux run "ss -ltnup 'sport = :3845'", on macOS "lsof -nP -i :3845", and on Windows "netstat -ano | findstr :3845" to see the local process. From another machine, "nmap -p 3845 <host>" shows whether it is reachable.