What ports need to be open for SQL Server?

Question

Which ports need to be opened in a firewall to access SQL server? Port 1433 for TCP is needed to connect to the SQL database instance. By default, SQL will attempt to use 1433. . Port 1434 for UDP is needed to allow the automatic discovery of SQL by the workstations.

What ports are required for SQL Server?

By default, the typical ports used by SQL Server and associated database engine services are: TCP 1433, 4022, 135, 1434, UDP 1434. The table below explains these ports in greater detail. A named instance uses dynamic ports.

Should I open port 1433?

By default, Microsoft Windows enables the Windows Firewall, which closes port 1433 to prevent Internet computers from connecting to a default instance of SQL Server on your computer. Connections to the default instance using TCP/IP are not possible unless you reopen port 1433.

What is the protocol and port necessary for a Microsoft SQL Server database connection?

Client systems use TCP 1433 to connect to the database engine; SQL Server Management Studio (SSMS) uses the port to manage instances of SQL Server across the network. You can reconfigure SQL Server to listen on a different port, but 1433 is by far the most common implementation.

How do I know if SQL Server is port 1433 open?

You can check TCP/IP connectivity to SQL Server by using telnet. For example, at the command prompt, type telnet 192.168. 0.0 1433 where 192.168. 0.0 is the address of the computer that is running SQL Server and 1433 is the port it is listening on.

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