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// Other services

Port 3779: Cognima Replication

Port 3779 is assigned by IANA to cognima (Cognima Replication).

3779

How cognima works

Other services
client:3779cognimaresponse client:3779cognimaresponse

The client sends a request to port 3779 and the cognima 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 3779 dangerous?

We have no specific security note for port 3779. 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 3779

ServicePortTransportDescriptionReferenceUpdated
cognima 3779 TCP, UDP Cognima Replication - 2003-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 3779, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3779'      # process listening on 3779
sudo lsof -nP -i :3779

macOS

sudo lsof -nP -i :3779

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3779 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3779
netstat -ano | findstr :3779

From another machine

nmap -p 3779 -sV <host>
sudo nmap -sU -p 3779 <host>
nc -zv <host> 3779

Block it in the firewall

sudo ufw deny 3779/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3779" -Direction Inbound -LocalPort 3779 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3779 used for?

Port 3779 is assigned by IANA to cognima (Cognima Replication).

Is port 3779 TCP or UDP?

Port 3779 is registered for TCP and UDP.

Is it safe to open port 3779?

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 3779 is open?

On Linux run "ss -ltnup 'sport = :3779'", on macOS "lsof -nP -i :3779", and on Windows "netstat -ano | findstr :3779" to see the local process. From another machine, "nmap -p 3779 <host>" shows whether it is reachable.

05 Related
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