Port 1433 · Microsoft SQL Server

Port 1433 is Microsoft SQL Server, TCP.

SQL Server default instance listener. Named instances use dynamic ports advertised by the SQL Browser service on 1434/UDP.

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-1433 protocol tcp port 1433

set rulebase security rules <rule-name> from <from-zone> to <to-zone> source any destination any application mssql-db service tcp-1433 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 :1433
• PowerShell Test-NetConnection <host> -Port 1433
• nmap nmap -p 1433 <host>

Related ports

• 1434 SQL Server Browser
• 2179 Hyper-V VMBus

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