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Port 862 (twamp-control, twamp-test)

IANA assigns port 862 to twamp-control, twamp-test: TWAMP-Control.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
twamp-control TCP TWAMP-Control IESG RFC 5357
twamp-test UDP TWAMP-Test Receiver Port IESG RFC 8545

Registry dates for this port: last modified 2018-12-21.

Check what is listening on port 862

Linux: is anything listening on TCP 862?
sudo ss -tlnp 'sport = :862'
Linux: UDP 862
sudo ss -ulnp 'sport = :862'
Linux / macOS: which process owns the port
sudo lsof -nP -i :862
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':862 '
Windows (Command Prompt)
netstat -ano | findstr :862
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 862 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 862
From Windows
Test-NetConnection HOST -Port 862
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 862

Block port 862 in the firewall

ufw
sudo ufw deny 862/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 862 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 862 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 862' -Direction Inbound -Protocol TCP -LocalPort 862 -Action Block
ufw
sudo ufw deny 862/udp
iptables
sudo iptables -A INPUT -p udp --dport 862 -j DROP
nftables
sudo nft add rule inet filter input udp dport 862 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 862' -Direction Inbound -Protocol UDP -LocalPort 862 -Action Block

Related ports

860iscsi861owamp-control, owamp-test873rsync daemon886iclcnet-locate

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.