HTTPfy

Port 457 (scohelp)

IANA assigns port 457 to scohelp.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
scohelp TCP scohelp Faith Zack -
scohelp UDP scohelp Faith Zack -

Check what is listening on port 457

Linux: is anything listening on TCP 457?
sudo ss -tlnp 'sport = :457'
Linux: UDP 457
sudo ss -ulnp 'sport = :457'
Linux / macOS: which process owns the port
sudo lsof -nP -i :457
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':457 '
Windows (Command Prompt)
netstat -ano | findstr :457
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 457 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 457
From Windows
Test-NetConnection HOST -Port 457
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 457

Block port 457 in the firewall

ufw
sudo ufw deny 457/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 457 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 457 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 457' -Direction Inbound -Protocol TCP -LocalPort 457 -Action Block
ufw
sudo ufw deny 457/udp
iptables
sudo iptables -A INPUT -p udp --dport 457 -j DROP
nftables
sudo nft add rule inet filter input udp dport 457 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 457' -Direction Inbound -Protocol UDP -LocalPort 457 -Action Block

Related ports

455creativepartnr456macon-tcp, macon-udp458appleqtc459ampr-rcmd

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