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Port 860 (iscsi)

IANA assigns port 860 to iscsi: iSCSI.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
iscsi TCP iSCSI IESG RFC 7143
iscsi UDP iSCSI IESG RFC 7143

Registry dates for this port: last modified 2013-08-27.

Check what is listening on port 860

Linux: is anything listening on TCP 860?
sudo ss -tlnp 'sport = :860'
Linux: UDP 860
sudo ss -ulnp 'sport = :860'
Linux / macOS: which process owns the port
sudo lsof -nP -i :860
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':860 '
Windows (Command Prompt)
netstat -ano | findstr :860
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 860 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 860
From Windows
Test-NetConnection HOST -Port 860
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 860

Block port 860 in the firewall

ufw
sudo ufw deny 860/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 860 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 860 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 860' -Direction Inbound -Protocol TCP -LocalPort 860 -Action Block
ufw
sudo ufw deny 860/udp
iptables
sudo iptables -A INPUT -p udp --dport 860 -j DROP
nftables
sudo nft add rule inet filter input udp dport 860 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 860' -Direction Inbound -Protocol UDP -LocalPort 860 -Action Block

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