Port 4843

opcua-tls · TCP/UDP

RangeRegistered port (1024–49151)
ProtocolTCP/UDP
Serviceopcua-tls
Registered2006-09
Modified2017-05-23

Frequently asked questions

What is port 4843 used for?

Port 4843 is registered with the IANA for opcua-tls (TCP/UDP). Description: OPC UA TCP Protocol over TLS/SSL.

Is port 4843 a well-known port?

No. Port 4843 is in the range 1024–49151 (registered or user ports). Ordinary programs may open it without root privileges.

How do I check whether port 4843 is open?

Locally on Linux with ss -tulpn | grep ':4843\b', on Windows with netstat -ano | findstr :4843. To test a remote host use Test-NetConnection <host> -Port 4843 in PowerShell or nc -zv <host> 4843 on Linux/macOS.

How do I open port 4843 in the firewall?

Ubuntu/Debian (ufw): sudo ufw allow 4843/tcp. Fedora/RHEL (firewalld): sudo firewall-cmd --add-port=4843/tcp --permanent, then firewall-cmd --reload. Windows (PowerShell as administrator): New-NetFirewallRule -DisplayName "Port 4843" -Direction Inbound -Protocol TCP -LocalPort 4843 -Action Allow.

IANA registry entries

ProtocolServiceDescription (IANA)
TCPopcua-tlsOPC UA TCP Protocol over TLS/SSL
UDPopcua-tlsOPC UA TCP Protocol over TLS/SSL

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