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Port 599 (acp)

IANA assigns port 599 to acp: Aeolon Core Protocol.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
acp TCP Aeolon Core Protocol Michael Alyn Miller -
acp UDP Aeolon Core Protocol Michael Alyn Miller -

Check what is listening on port 599

Linux: is anything listening on TCP 599?
sudo ss -tlnp 'sport = :599'
Linux: UDP 599
sudo ss -ulnp 'sport = :599'
Linux / macOS: which process owns the port
sudo lsof -nP -i :599
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':599 '
Windows (Command Prompt)
netstat -ano | findstr :599
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 599 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 599
From Windows
Test-NetConnection HOST -Port 599
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 599

Block port 599 in the firewall

ufw
sudo ufw deny 599/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 599 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 599 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 599' -Direction Inbound -Protocol TCP -LocalPort 599 -Action Block
ufw
sudo ufw deny 599/udp
iptables
sudo iptables -A INPUT -p udp --dport 599 -j DROP
nftables
sudo nft add rule inet filter input udp dport 599 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 599' -Direction Inbound -Protocol UDP -LocalPort 599 -Action Block

Related ports

597ptcnameservice598sco-websrvrmg3600ipcserver601Syslog (reliable, TCP)

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.