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Port 8377 (cruise-swroute)

IANA assigns port 8377 to cruise-swroute: Cruise SWROUTE.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cruise-swroute TCP Cruise SWROUTE Steve Husak -
cruise-swroute UDP Cruise SWROUTE Steve Husak -

Check what is listening on port 8377

Linux: is anything listening on TCP 8377?
sudo ss -tlnp 'sport = :8377'
Linux: UDP 8377
sudo ss -ulnp 'sport = :8377'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8377
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8377 '
Windows (Command Prompt)
netstat -ano | findstr :8377
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8377 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8377
From Windows
Test-NetConnection HOST -Port 8377
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8377

Block port 8377 in the firewall

ufw
sudo ufw deny 8377/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8377 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8377 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8377' -Direction Inbound -Protocol TCP -LocalPort 8377 -Action Block
ufw
sudo ufw deny 8377/udp
iptables
sudo iptables -A INPUT -p udp --dport 8377 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8377 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8377' -Direction Inbound -Protocol UDP -LocalPort 8377 -Action Block

Related ports

8351server-find8376cruise-enum8378cruise-config8379cruise-diags

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