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// Other services

Port 457: scohelp

Port 457 is assigned by IANA to scohelp (scohelp).

457

How scohelp works

Other services
client:457scohelpresponse client:457scohelpresponse

The client sends a request to port 457 and the scohelp service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 457 dangerous?

We have no specific security note for port 457. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 457

ServicePortTransportDescriptionReferenceUpdated
scohelp 457 TCP, UDP scohelp - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 457, and is it reachable?

Linux

sudo ss -ltnup 'sport = :457'      # process listening on 457
sudo lsof -nP -i :457

macOS

sudo lsof -nP -i :457

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 457 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 457
netstat -ano | findstr :457

From another machine

nmap -p 457 -sV <host>
sudo nmap -sU -p 457 <host>
nc -zv <host> 457

Block it in the firewall

sudo ufw deny 457/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 457" -Direction Inbound -LocalPort 457 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 457 used for?

Port 457 is assigned by IANA to scohelp (scohelp).

Is port 457 TCP or UDP?

Port 457 is registered for TCP and UDP.

Is it safe to open port 457?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 457 is open?

On Linux run "ss -ltnup 'sport = :457'", on macOS "lsof -nP -i :457", and on Windows "netstat -ano | findstr :457" to see the local process. From another machine, "nmap -p 457 <host>" shows whether it is reachable.

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