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Port 4336 (restconf-ch-tls)

IANA assigns port 4336 to restconf-ch-tls: RESTCONF Call Home (TLS).

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
restconf-ch-tls TCP RESTCONF Call Home (TLS) IESG RFC 8071

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

Check what is listening on port 4336

Linux: is anything listening on TCP 4336?
sudo ss -tlnp 'sport = :4336'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4336
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4336 '
Windows (Command Prompt)
netstat -ano | findstr :4336
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4336 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4336
From Windows
Test-NetConnection HOST -Port 4336

Block port 4336 in the firewall

ufw
sudo ufw deny 4336/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4336 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4336 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4336' -Direction Inbound -Protocol TCP -LocalPort 4336 -Action Block

Related ports

4334netconf-ch-ssh4335netconf-ch-tls4340gaia4341lisp-data

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