CyberHunter
Local dataset, no network
// Other services

Port 3709: CA-IDMS Server

Port 3709 is assigned by IANA to ca-idms (CA-IDMS Server).

3709

How ca-idms works

Other services
client:3709ca-idmsresponse client:3709ca-idmsresponse

The client sends a request to port 3709 and the ca-idms 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 3709 dangerous?

We have no specific security note for port 3709. 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 3709

ServicePortTransportDescriptionReferenceUpdated
ca-idms 3709 TCP, UDP CA-IDMS Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3709, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3709'      # process listening on 3709
sudo lsof -nP -i :3709

macOS

sudo lsof -nP -i :3709

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3709 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3709
netstat -ano | findstr :3709

From another machine

nmap -p 3709 -sV <host>
sudo nmap -sU -p 3709 <host>
nc -zv <host> 3709

Block it in the firewall

sudo ufw deny 3709/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3709" -Direction Inbound -LocalPort 3709 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3709 used for?

Port 3709 is assigned by IANA to ca-idms (CA-IDMS Server).

Is port 3709 TCP or UDP?

Port 3709 is registered for TCP and UDP.

Is it safe to open port 3709?

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 3709 is open?

On Linux run "ss -ltnup 'sport = :3709'", on macOS "lsof -nP -i :3709", and on Windows "netstat -ano | findstr :3709" to see the local process. From another machine, "nmap -p 3709 <host>" shows whether it is reachable.

05 Related
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