Port 1883 · MQTT

Port 1883 is MQTT, TCP.

Message Queuing Telemetry Transport — lightweight pub/sub protocol for IoT devices. Unencrypted.

Palo Alto

Create the service object for this port, then allow the App-ID on it. Restricting the rule to the port's service object keeps the rule working on a non-default port and stops the App-ID matching on other ports. Replace the placeholders with your own rule name and zones.

set service tcp-1883 protocol tcp port 1883

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application mqtt service tcp-1883 action allow

Risk and exposure

Rated medium risk. Restrict this port to the sources that need it and keep the service patched; avoid exposing it to the whole internet unless the service is meant to be public.

Check it

• Linux ss -tlnp | grep :1883
• PowerShell Test-NetConnection <host> -Port 1883
• nmap nmap -p 1883 <host>

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