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Port 830 (netconf-ssh)

IANA assigns port 830 to netconf-ssh: NETCONF over SSH.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
netconf-ssh TCP NETCONF over SSH - RFC 6242
netconf-ssh UDP NETCONF over SSH - RFC 6242

Check what is listening on port 830

Linux: is anything listening on TCP 830?
sudo ss -tlnp 'sport = :830'
Linux: UDP 830
sudo ss -ulnp 'sport = :830'
Linux / macOS: which process owns the port
sudo lsof -nP -i :830
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':830 '
Windows (Command Prompt)
netstat -ano | findstr :830
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 830 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 830
From Windows
Test-NetConnection HOST -Port 830
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 830

Block port 830 in the firewall

ufw
sudo ufw deny 830/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 830 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 830 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 830' -Direction Inbound -Protocol TCP -LocalPort 830 -Action Block
ufw
sudo ufw deny 830/udp
iptables
sudo iptables -A INPUT -p udp --dport 830 -j DROP
nftables
sudo nft add rule inet filter input udp dport 830 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 830' -Direction Inbound -Protocol UDP -LocalPort 830 -Action Block

Related ports

828itm-mcell-s829pkix-3-ca-ra847dhcp-failover2848gdoi

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.