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// Other services

Port 3056: CDL Server

Port 3056 is assigned by IANA to cdl-server (CDL Server).

3056

How cdl-server works

Other services
client:3056cdl-serverresponse client:3056cdl-serverresponse

The client sends a request to port 3056 and the cdl-server 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 3056 dangerous?

We have no specific security note for port 3056. 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 3056

ServicePortTransportDescriptionReferenceUpdated
cdl-server 3056 TCP, UDP CDL Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3056, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3056'      # process listening on 3056
sudo lsof -nP -i :3056

macOS

sudo lsof -nP -i :3056

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3056 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3056
netstat -ano | findstr :3056

From another machine

nmap -p 3056 -sV <host>
sudo nmap -sU -p 3056 <host>
nc -zv <host> 3056

Block it in the firewall

sudo ufw deny 3056/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3056" -Direction Inbound -LocalPort 3056 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3056 used for?

Port 3056 is assigned by IANA to cdl-server (CDL Server).

Is port 3056 TCP or UDP?

Port 3056 is registered for TCP and UDP.

Is it safe to open port 3056?

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 3056 is open?

On Linux run "ss -ltnup 'sport = :3056'", on macOS "lsof -nP -i :3056", and on Windows "netstat -ano | findstr :3056" to see the local process. From another machine, "nmap -p 3056 <host>" shows whether it is reachable.

05 Related
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