HTTPfy

Port 4334 (netconf-ch-ssh)

IANA assigns port 4334 to netconf-ch-ssh: NETCONF Call Home (SSH).

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netconf-ch-ssh TCP NETCONF Call Home (SSH) IESG RFC 8071

Registry dates for this port: registered 2016-01-12.

Check what is listening on port 4334

Linux: is anything listening on TCP 4334?
sudo ss -tlnp 'sport = :4334'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4334
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4334 '
Windows (Command Prompt)
netstat -ano | findstr :4334
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4334 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4334
From Windows
Test-NetConnection HOST -Port 4334

Block port 4334 in the firewall

ufw
sudo ufw deny 4334/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4334 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4334 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4334' -Direction Inbound -Protocol TCP -LocalPort 4334 -Action Block

Related ports

4332getty-focus4333ahsp4335netconf-ch-tls4336restconf-ch-tls

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