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// Other services

Port 475: tcpnethaspsrv

Port 475 is assigned by IANA to tcpnethaspsrv (tcpnethaspsrv).

475

How tcpnethaspsrv works

Other services
client:475tcpnethaspsrvresponse client:475tcpnethaspsrvresponse

The client sends a request to port 475 and the tcpnethaspsrv 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 475 dangerous?

We have no specific security note for port 475. 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 475

ServicePortTransportDescriptionReferenceUpdated
tcpnethaspsrv 475 TCP, UDP tcpnethaspsrv - 2010-07-23

// source: IANA service name and port number registry

03 Check it

Which program uses port 475, and is it reachable?

Linux

sudo ss -ltnup 'sport = :475'      # process listening on 475
sudo lsof -nP -i :475

macOS

sudo lsof -nP -i :475

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 475 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 475
netstat -ano | findstr :475

From another machine

nmap -p 475 -sV <host>
sudo nmap -sU -p 475 <host>
nc -zv <host> 475

Block it in the firewall

sudo ufw deny 475/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 475" -Direction Inbound -LocalPort 475 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 475 used for?

Port 475 is assigned by IANA to tcpnethaspsrv (tcpnethaspsrv).

Is port 475 TCP or UDP?

Port 475 is registered for TCP and UDP.

Is it safe to open port 475?

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 475 is open?

On Linux run "ss -ltnup 'sport = :475'", on macOS "lsof -nP -i :475", and on Windows "netstat -ano | findstr :475" to see the local process. From another machine, "nmap -p 475 <host>" shows whether it is reachable.

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