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// Other services

Port 3378: WSICOPY

Port 3378 is assigned by IANA to wsicopy (WSICOPY).

3378

How wsicopy works

Other services
client:3378wsicopyresponse client:3378wsicopyresponse

The client sends a request to port 3378 and the wsicopy 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 3378 dangerous?

We have no specific security note for port 3378. 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 3378

ServicePortTransportDescriptionReferenceUpdated
wsicopy 3378 TCP, UDP WSICOPY - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3378, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3378'      # process listening on 3378
sudo lsof -nP -i :3378

macOS

sudo lsof -nP -i :3378

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3378 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3378
netstat -ano | findstr :3378

From another machine

nmap -p 3378 -sV <host>
sudo nmap -sU -p 3378 <host>
nc -zv <host> 3378

Block it in the firewall

sudo ufw deny 3378/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3378" -Direction Inbound -LocalPort 3378 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3378 used for?

Port 3378 is assigned by IANA to wsicopy (WSICOPY).

Is port 3378 TCP or UDP?

Port 3378 is registered for TCP and UDP.

Is it safe to open port 3378?

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 3378 is open?

On Linux run "ss -ltnup 'sport = :3378'", on macOS "lsof -nP -i :3378", and on Windows "netstat -ano | findstr :3378" to see the local process. From another machine, "nmap -p 3378 <host>" shows whether it is reachable.

05 Related
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