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Port 8379 (cruise-diags)

IANA assigns port 8379 to cruise-diags: Cruise DIAGS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cruise-diags TCP Cruise DIAGS Steve Husak -
cruise-diags UDP Cruise DIAGS Steve Husak -

Check what is listening on port 8379

Linux: is anything listening on TCP 8379?
sudo ss -tlnp 'sport = :8379'
Linux: UDP 8379
sudo ss -ulnp 'sport = :8379'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8379
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8379 '
Windows (Command Prompt)
netstat -ano | findstr :8379
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8379 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8379
From Windows
Test-NetConnection HOST -Port 8379
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8379

Block port 8379 in the firewall

ufw
sudo ufw deny 8379/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8379 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8379 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8379' -Direction Inbound -Protocol TCP -LocalPort 8379 -Action Block
ufw
sudo ufw deny 8379/udp
iptables
sudo iptables -A INPUT -p udp --dport 8379 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8379 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8379' -Direction Inbound -Protocol UDP -LocalPort 8379 -Action Block

Related ports

8377cruise-swroute8378cruise-config8380cruise-update8383m2mservices

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