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Port 452 (sfs-config)

IANA assigns port 452 to sfs-config: Cray SFS config server.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
sfs-config TCP Cray SFS config server Walter Poxon -
sfs-config UDP Cray SFS config server Walter Poxon -

Check what is listening on port 452

Linux: is anything listening on TCP 452?
sudo ss -tlnp 'sport = :452'
Linux: UDP 452
sudo ss -ulnp 'sport = :452'
Linux / macOS: which process owns the port
sudo lsof -nP -i :452
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':452 '
Windows (Command Prompt)
netstat -ano | findstr :452
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 452 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 452
From Windows
Test-NetConnection HOST -Port 452
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 452

Block port 452 in the firewall

ufw
sudo ufw deny 452/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 452 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 452 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 452' -Direction Inbound -Protocol TCP -LocalPort 452 -Action Block
ufw
sudo ufw deny 452/udp
iptables
sudo iptables -A INPUT -p udp --dport 452 -j DROP
nftables
sudo nft add rule inet filter input udp dport 452 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 452' -Direction Inbound -Protocol UDP -LocalPort 452 -Action Block

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