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// Other services

Port 8402: abarsd

Port 8402 is assigned by IANA to abarsd (abarsd).

8402

How abarsd works

Other services
client:8402abarsdresponse client:8402abarsdresponse

The client sends a request to port 8402 and the abarsd 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
Registered (1024-49151)
Category
Other services
01 Security

Is port 8402 dangerous?

We have no specific security note for port 8402. 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 8402

ServicePortTransportDescriptionReferenceUpdated
abarsd 8402 TCP, UDP abarsd - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 8402, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8402'      # process listening on 8402
sudo lsof -nP -i :8402

macOS

sudo lsof -nP -i :8402

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8402 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8402
netstat -ano | findstr :8402

From another machine

nmap -p 8402 -sV <host>
sudo nmap -sU -p 8402 <host>
nc -zv <host> 8402

Block it in the firewall

sudo ufw deny 8402/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8402" -Direction Inbound -LocalPort 8402 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8402 used for?

Port 8402 is assigned by IANA to abarsd (abarsd).

Is port 8402 TCP or UDP?

Port 8402 is registered for TCP and UDP.

Is it safe to open port 8402?

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 8402 is open?

On Linux run "ss -ltnup 'sport = :8402'", on macOS "lsof -nP -i :8402", and on Windows "netstat -ano | findstr :8402" to see the local process. From another machine, "nmap -p 8402 <host>" shows whether it is reachable.

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