CyberHunter
Local dataset, no network
// Other services

Port 680: entrust-aaas

Port 680 is assigned by IANA to entrust-aaas (entrust-aaas).

680

How entrust-aaas works

Other services
client:680entrust-aaasresponse client:680entrust-aaasresponse

The client sends a request to port 680 and the entrust-aaas 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 680 dangerous?

We have no specific security note for port 680. 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 680

ServicePortTransportDescriptionReferenceUpdated
entrust-aaas 680 TCP, UDP entrust-aaas - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 680, and is it reachable?

Linux

sudo ss -ltnup 'sport = :680'      # process listening on 680
sudo lsof -nP -i :680

macOS

sudo lsof -nP -i :680

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 680 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 680
netstat -ano | findstr :680

From another machine

nmap -p 680 -sV <host>
sudo nmap -sU -p 680 <host>
nc -zv <host> 680

Block it in the firewall

sudo ufw deny 680/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 680" -Direction Inbound -LocalPort 680 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 680 used for?

Port 680 is assigned by IANA to entrust-aaas (entrust-aaas).

Is port 680 TCP or UDP?

Port 680 is registered for TCP and UDP.

Is it safe to open port 680?

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 680 is open?

On Linux run "ss -ltnup 'sport = :680'", on macOS "lsof -nP -i :680", and on Windows "netstat -ano | findstr :680" to see the local process. From another machine, "nmap -p 680 <host>" shows whether it is reachable.

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