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// Other services

Port 4377: Cambridge Pixel SPx Server

Port 4377 is assigned by IANA to cp-spxsvr (Cambridge Pixel SPx Server).

4377

How cp-spxsvr works

Other services
client:4377cp-spxsvrresponse client:4377cp-spxsvrresponse

The client sends a request to port 4377 and the cp-spxsvr 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 4377 dangerous?

We have no specific security note for port 4377. 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 4377

ServicePortTransportDescriptionReferenceUpdated
cp-spxsvr 4377 TCP, UDP Cambridge Pixel SPx Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4377, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4377'      # process listening on 4377
sudo lsof -nP -i :4377

macOS

sudo lsof -nP -i :4377

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4377 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4377
netstat -ano | findstr :4377

From another machine

nmap -p 4377 -sV <host>
sudo nmap -sU -p 4377 <host>
nc -zv <host> 4377

Block it in the firewall

sudo ufw deny 4377/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4377" -Direction Inbound -LocalPort 4377 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4377 used for?

Port 4377 is assigned by IANA to cp-spxsvr (Cambridge Pixel SPx Server).

Is port 4377 TCP or UDP?

Port 4377 is registered for TCP and UDP.

Is it safe to open port 4377?

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 4377 is open?

On Linux run "ss -ltnup 'sport = :4377'", on macOS "lsof -nP -i :4377", and on Windows "netstat -ano | findstr :4377" to see the local process. From another machine, "nmap -p 4377 <host>" shows whether it is reachable.

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