CyberHunter
Local dataset, no network
// Other services

Port 577: vnas

Port 577 is assigned by IANA to vnas (vnas).

577

How vnas works

Other services
client:577vnasresponse client:577vnasresponse

The client sends a request to port 577 and the vnas 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 577 dangerous?

We have no specific security note for port 577. 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 577

ServicePortTransportDescriptionReferenceUpdated
vnas 577 TCP, UDP vnas - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 577, and is it reachable?

Linux

sudo ss -ltnup 'sport = :577'      # process listening on 577
sudo lsof -nP -i :577

macOS

sudo lsof -nP -i :577

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 577 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 577
netstat -ano | findstr :577

From another machine

nmap -p 577 -sV <host>
sudo nmap -sU -p 577 <host>
nc -zv <host> 577

Block it in the firewall

sudo ufw deny 577/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 577" -Direction Inbound -LocalPort 577 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 577 used for?

Port 577 is assigned by IANA to vnas (vnas).

Is port 577 TCP or UDP?

Port 577 is registered for TCP and UDP.

Is it safe to open port 577?

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 577 is open?

On Linux run "ss -ltnup 'sport = :577'", on macOS "lsof -nP -i :577", and on Windows "netstat -ano | findstr :577" to see the local process. From another machine, "nmap -p 577 <host>" shows whether it is reachable.

05 Related
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