CyberHunter
Local dataset, no network
// Other services

Port 2771: Vergence CM

Port 2771 is assigned by IANA to vergencecm (Vergence CM).

2771

How vergencecm works

Other services
client:2771vergencecmresponse client:2771vergencecmresponse

The client sends a request to port 2771 and the vergencecm 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 2771 dangerous?

We have no specific security note for port 2771. 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 2771

ServicePortTransportDescriptionReferenceUpdated
vergencecm 2771 TCP, UDP Vergence CM - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2771, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2771'      # process listening on 2771
sudo lsof -nP -i :2771

macOS

sudo lsof -nP -i :2771

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2771 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2771
netstat -ano | findstr :2771

From another machine

nmap -p 2771 -sV <host>
sudo nmap -sU -p 2771 <host>
nc -zv <host> 2771

Block it in the firewall

sudo ufw deny 2771/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2771" -Direction Inbound -LocalPort 2771 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2771 used for?

Port 2771 is assigned by IANA to vergencecm (Vergence CM).

Is port 2771 TCP or UDP?

Port 2771 is registered for TCP and UDP.

Is it safe to open port 2771?

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 2771 is open?

On Linux run "ss -ltnup 'sport = :2771'", on macOS "lsof -nP -i :2771", and on Windows "netstat -ano | findstr :2771" to see the local process. From another machine, "nmap -p 2771 <host>" shows whether it is reachable.

05 Related
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