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// Other services

Port 3802: VHD

Port 3802 is assigned by IANA to vhd (VHD).

3802

How vhd works

Other services
client:3802vhdresponse client:3802vhdresponse

The client sends a request to port 3802 and the vhd service answers.

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
Other services
01 Security

Is port 3802 dangerous?

We have no specific security note for port 3802. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 3802

ServicePortTransportDescriptionReferenceUpdated
vhd 3802 TCP, UDP VHD - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3802, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3802'      # process listening on 3802
sudo lsof -nP -i :3802

macOS

sudo lsof -nP -i :3802

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3802 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3802
netstat -ano | findstr :3802

From another machine

nmap -p 3802 -sV <host>
sudo nmap -sU -p 3802 <host>
nc -zv <host> 3802

Block it in the firewall

sudo ufw deny 3802/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3802" -Direction Inbound -LocalPort 3802 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3802 used for?

Port 3802 is assigned by IANA to vhd (VHD).

Is port 3802 TCP or UDP?

Port 3802 is registered for TCP and UDP.

Is it safe to open port 3802?

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. Close the port if nothing on the host needs it.

How do I check if port 3802 is open?

On Linux run "ss -ltnup 'sport = :3802'", on macOS "lsof -nP -i :3802", and on Windows "netstat -ano | findstr :3802" to see the local process. From another machine, "nmap -p 3802 <host>" shows whether it is reachable.

05 Related
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