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// Other services

Port 2770: Veronica

Port 2770 is assigned by IANA to veronica (Veronica).

2770

How veronica works

Other services
client:2770veronicaresponse client:2770veronicaresponse

The client sends a request to port 2770 and the veronica 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 2770 dangerous?

We have no specific security note for port 2770. 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 2770

ServicePortTransportDescriptionReferenceUpdated
veronica 2770 TCP, UDP Veronica - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2770, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2770'      # process listening on 2770
sudo lsof -nP -i :2770

macOS

sudo lsof -nP -i :2770

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2770 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2770
netstat -ano | findstr :2770

From another machine

nmap -p 2770 -sV <host>
sudo nmap -sU -p 2770 <host>
nc -zv <host> 2770

Block it in the firewall

sudo ufw deny 2770/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2770" -Direction Inbound -LocalPort 2770 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2770 used for?

Port 2770 is assigned by IANA to veronica (Veronica).

Is port 2770 TCP or UDP?

Port 2770 is registered for TCP and UDP.

Is it safe to open port 2770?

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 2770 is open?

On Linux run "ss -ltnup 'sport = :2770'", on macOS "lsof -nP -i :2770", and on Windows "netstat -ano | findstr :2770" to see the local process. From another machine, "nmap -p 2770 <host>" shows whether it is reachable.

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