CyberHunter
Local dataset, no network
// Other services

Port 375: Hassle

Port 375 is assigned by IANA to hassle (Hassle).

375

How hassle works

Other services
client:375hassleresponse client:375hassleresponse

The client sends a request to port 375 and the hassle 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 375 dangerous?

We have no specific security note for port 375. 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 375

ServicePortTransportDescriptionReferenceUpdated
hassle 375 TCP, UDP Hassle - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 375, and is it reachable?

Linux

sudo ss -ltnup 'sport = :375'      # process listening on 375
sudo lsof -nP -i :375

macOS

sudo lsof -nP -i :375

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 375 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 375
netstat -ano | findstr :375

From another machine

nmap -p 375 -sV <host>
sudo nmap -sU -p 375 <host>
nc -zv <host> 375

Block it in the firewall

sudo ufw deny 375/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 375" -Direction Inbound -LocalPort 375 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 375 used for?

Port 375 is assigned by IANA to hassle (Hassle).

Is port 375 TCP or UDP?

Port 375 is registered for TCP and UDP.

Is it safe to open port 375?

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 375 is open?

On Linux run "ss -ltnup 'sport = :375'", on macOS "lsof -nP -i :375", and on Windows "netstat -ano | findstr :375" to see the local process. From another machine, "nmap -p 375 <host>" shows whether it is reachable.

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