Port 1433 — MSSQL

TCP · Port 1433/TCP is used for Microsoft SQL Server (MSSQL) connections, allowing clients to access and manage database servers. This port is a common target for attacks as it provides access to sensitive data. Secure configuration and monitoring of MSSQL services are essential.

Port Number: 1433
Service Name: MSSQL
Protocol: TCP
Common Software: Microsoft SQL Server

Security Notes

Review IANA registry for port 1433 usage. Apply principle of least privilege - only open ports that are required.

FAQ

What is port 1433 used for?

Port 1433 is used for MSSQL. Port 1433/TCP is used for Microsoft SQL Server (MSSQL) connections, allowing clients to access and manage database servers. This port is a common target for attacks as it provides access to sensitive data. Secure configuration and monitoring of MSSQL services are essential. Common software: Microsoft SQL Server.

Is port 1433 dangerous to leave open?

Review IANA registry for port 1433 usage. Apply principle of least privilege - only open ports that are required.

How do I check if port 1433 is open?

Use nmap: nmap -p 1433 <target> or check locally: ss -tlnp | rg 1433