HTTPfy

Port 574 (ftp-agent)

IANA assigns port 574 to ftp-agent: FTP Software Agent System.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
ftp-agent TCP FTP Software Agent System Michael S Greenberg -
ftp-agent UDP FTP Software Agent System Michael S Greenberg -

Check what is listening on port 574

Linux: is anything listening on TCP 574?
sudo ss -tlnp 'sport = :574'
Linux: UDP 574
sudo ss -ulnp 'sport = :574'
Linux / macOS: which process owns the port
sudo lsof -nP -i :574
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':574 '
Windows (Command Prompt)
netstat -ano | findstr :574
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 574 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 574
From Windows
Test-NetConnection HOST -Port 574
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 574

Block port 574 in the firewall

ufw
sudo ufw deny 574/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 574 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 574 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 574' -Direction Inbound -Protocol TCP -LocalPort 574 -Action Block
ufw
sudo ufw deny 574/udp
iptables
sudo iptables -A INPUT -p udp --dport 574 -j DROP
nftables
sudo nft add rule inet filter input udp dport 574 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 574' -Direction Inbound -Protocol UDP -LocalPort 574 -Action Block

Related ports

572sonar573banyan-vip575vemmi576ipcd

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