HTTPfy

Port 5304 (hacl-local)

IANA assigns port 5304 to hacl-local: HA Cluster Commands.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
hacl-local TCP HA Cluster Commands Eric Soderberg 2, Edward Yim -
hacl-local UDP HA Cluster Commands Eric Soderberg 2, Edward Yim -

Check what is listening on port 5304

Linux: is anything listening on TCP 5304?
sudo ss -tlnp 'sport = :5304'
Linux: UDP 5304
sudo ss -ulnp 'sport = :5304'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5304
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5304 '
Windows (Command Prompt)
netstat -ano | findstr :5304
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5304 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5304
From Windows
Test-NetConnection HOST -Port 5304
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5304

Block port 5304 in the firewall

ufw
sudo ufw deny 5304/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5304 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5304 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5304' -Direction Inbound -Protocol TCP -LocalPort 5304 -Action Block
ufw
sudo ufw deny 5304/udp
iptables
sudo iptables -A INPUT -p udp --dport 5304 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5304 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5304' -Direction Inbound -Protocol UDP -LocalPort 5304 -Action Block

Related ports

5302hacl-cfg5303hacl-probe5305hacl-test5306sun-mc-grp

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