Port 1433

Q: What is port 1433?

Microsoft SQL Server database Port 1433 is the default port for Microsoft SQL Server, the database engine powering Windows applications, ERP systems, CRM platforms, and .NET applications. It is one of the most frequently targeted database ports on the internet, subject to brute-force attacks, SQL injection exploitation, and ransomware delivery. It must never be directly accessible from the internet — always protect with a firewall, strong credentials, and current patch levels.

MS-SQL

Microsoft SQL Server database

Port

1433

Protocol

TCP

Service

MS-SQL

Security

Dangerous

Full name: Microsoft SQL Server

What is port 1433?

Port 1433 is the default port for Microsoft SQL Server, the database engine powering Windows applications, ERP systems, CRM platforms, and .NET applications. It is one of the most frequently targeted database ports on the internet, subject to brute-force attacks, SQL injection exploitation, and ransomware delivery. It must never be directly accessible from the internet — always protect with a firewall, strong credentials, and current patch levels.

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