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// Other services

Port 2045:

Port 2045 is assigned by IANA to cdfunc ().

2045

How cdfunc works

Other services
client:2045cdfuncresponse client:2045cdfuncresponse

The client sends a request to port 2045 and the cdfunc 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 2045 dangerous?

We have no specific security note for port 2045. 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 2045

ServicePortTransportDescriptionReferenceUpdated
cdfunc 2045 TCP, UDP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2045, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2045'      # process listening on 2045
sudo lsof -nP -i :2045

macOS

sudo lsof -nP -i :2045

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2045 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2045
netstat -ano | findstr :2045

From another machine

nmap -p 2045 -sV <host>
sudo nmap -sU -p 2045 <host>
nc -zv <host> 2045

Block it in the firewall

sudo ufw deny 2045/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2045" -Direction Inbound -LocalPort 2045 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2045 used for?

Port 2045 is assigned by IANA to cdfunc ().

Is port 2045 TCP or UDP?

Port 2045 is registered for TCP and UDP.

Is it safe to open port 2045?

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 2045 is open?

On Linux run "ss -ltnup 'sport = :2045'", on macOS "lsof -nP -i :2045", and on Windows "netstat -ano | findstr :2045" to see the local process. From another machine, "nmap -p 2045 <host>" shows whether it is reachable.

05 Related
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