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// Other services

Port 3441: OC Connect Client

Port 3441 is assigned by IANA to connect-client (OC Connect Client).

3441

How connect-client works

Other services
client:3441connect-clientresponse client:3441connect-clientresponse

The client sends a request to port 3441 and the connect-client 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 3441 dangerous?

We have no specific security note for port 3441. 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 3441

ServicePortTransportDescriptionReferenceUpdated
connect-client 3441 TCP, UDP OC Connect Client - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3441, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3441'      # process listening on 3441
sudo lsof -nP -i :3441

macOS

sudo lsof -nP -i :3441

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3441 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3441
netstat -ano | findstr :3441

From another machine

nmap -p 3441 -sV <host>
sudo nmap -sU -p 3441 <host>
nc -zv <host> 3441

Block it in the firewall

sudo ufw deny 3441/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3441" -Direction Inbound -LocalPort 3441 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3441 used for?

Port 3441 is assigned by IANA to connect-client (OC Connect Client).

Is port 3441 TCP or UDP?

Port 3441 is registered for TCP and UDP.

Is it safe to open port 3441?

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 3441 is open?

On Linux run "ss -ltnup 'sport = :3441'", on macOS "lsof -nP -i :3441", and on Windows "netstat -ano | findstr :3441" to see the local process. From another machine, "nmap -p 3441 <host>" shows whether it is reachable.

05 Related
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