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// Other services

Port 599: Aeolon Core Protocol

Port 599 is assigned by IANA to acp (Aeolon Core Protocol).

599

How acp works

Other services
client:599acpresponse client:599acpresponse

The client sends a request to port 599 and the acp 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 599 dangerous?

We have no specific security note for port 599. 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 599

ServicePortTransportDescriptionReferenceUpdated
acp 599 TCP, UDP Aeolon Core Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 599, and is it reachable?

Linux

sudo ss -ltnup 'sport = :599'      # process listening on 599
sudo lsof -nP -i :599

macOS

sudo lsof -nP -i :599

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 599 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 599
netstat -ano | findstr :599

From another machine

nmap -p 599 -sV <host>
sudo nmap -sU -p 599 <host>
nc -zv <host> 599

Block it in the firewall

sudo ufw deny 599/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 599" -Direction Inbound -LocalPort 599 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 599 used for?

Port 599 is assigned by IANA to acp (Aeolon Core Protocol).

Is port 599 TCP or UDP?

Port 599 is registered for TCP and UDP.

Is it safe to open port 599?

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 599 is open?

On Linux run "ss -ltnup 'sport = :599'", on macOS "lsof -nP -i :599", and on Windows "netstat -ano | findstr :599" to see the local process. From another machine, "nmap -p 599 <host>" shows whether it is reachable.

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