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// Other services

Port 3356: UPNOTIFYPS

Port 3356 is assigned by IANA to upnotifyps (UPNOTIFYPS).

3356

How upnotifyps works

Other services
client:3356upnotifypsresponse client:3356upnotifypsresponse

The client sends a request to port 3356 and the upnotifyps 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 3356 dangerous?

We have no specific security note for port 3356. 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 3356

ServicePortTransportDescriptionReferenceUpdated
upnotifyps 3356 TCP, UDP UPNOTIFYPS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3356, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3356'      # process listening on 3356
sudo lsof -nP -i :3356

macOS

sudo lsof -nP -i :3356

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3356 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3356
netstat -ano | findstr :3356

From another machine

nmap -p 3356 -sV <host>
sudo nmap -sU -p 3356 <host>
nc -zv <host> 3356

Block it in the firewall

sudo ufw deny 3356/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3356" -Direction Inbound -LocalPort 3356 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3356 used for?

Port 3356 is assigned by IANA to upnotifyps (UPNOTIFYPS).

Is port 3356 TCP or UDP?

Port 3356 is registered for TCP and UDP.

Is it safe to open port 3356?

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 3356 is open?

On Linux run "ss -ltnup 'sport = :3356'", on macOS "lsof -nP -i :3356", and on Windows "netstat -ano | findstr :3356" to see the local process. From another machine, "nmap -p 3356 <host>" shows whether it is reachable.

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