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// Other services

Port 862: TWAMP-Control

Port 862 is assigned by IANA to twamp-control (TWAMP-Control), twamp-test (TWAMP-Test Receiver Port).

862

How twamp-control works

Other services
client:862twamp-controlresponse client:862twamp-controlresponse

The client sends a request to port 862 and the twamp-control service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 862 dangerous?

We have no specific security note for port 862. 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 862

ServicePortTransportDescriptionReferenceUpdated
twamp-control 862 TCP TWAMP-Control RFC 5357 -
twamp-test 862 UDP TWAMP-Test Receiver Port RFC 8545 2018-12-21

// source: IANA service name and port number registry

03 Check it

Which program uses port 862, and is it reachable?

Linux

sudo ss -ltnup 'sport = :862'      # process listening on 862
sudo lsof -nP -i :862

macOS

sudo lsof -nP -i :862

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 862 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 862
netstat -ano | findstr :862

From another machine

nmap -p 862 -sV <host>
sudo nmap -sU -p 862 <host>
nc -zv <host> 862

Block it in the firewall

sudo ufw deny 862/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 862" -Direction Inbound -LocalPort 862 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 862 used for?

Port 862 is assigned by IANA to twamp-control (TWAMP-Control), twamp-test (TWAMP-Test Receiver Port).

Is port 862 TCP or UDP?

Port 862 is registered for TCP and UDP.

Is it safe to open port 862?

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 862 is open?

On Linux run "ss -ltnup 'sport = :862'", on macOS "lsof -nP -i :862", and on Windows "netstat -ano | findstr :862" to see the local process. From another machine, "nmap -p 862 <host>" shows whether it is reachable.

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