The default instance of the Database Engine listens on port 1433; therefore, you do not have to configure a fixed port. However, named instances including SQL Server 2005 Express Edition listen on dynamic ports. Before you can open a port in the firewall, you must first configure the Database Engine to listen on a specific port known as a fixed port or a static port; otherwise, the Database Engine might listen on a different port each time it is started.
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In SQL Server Configuration Manager, expand SQL Server Network Configuration, and then click on the server instance you want to configure.
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In the right pane, double-click TCP/IP.
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In the TCP/IP Properties dialog box, click the IP Addresses tab.
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In the TCP Port box of the IPAll section, type an available port number. For this tutorial, we will use 49172.
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Click OK to close the dialog box, and click OK to the warning that the service must be restarted.
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In the left pane, click SQL Server Services.
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In the right pane, right-click the instance of SQL Server, and then click Restart. When the Database Engine restarts, it will listen on port 49172.
Port number assignments are managed by the Internet Assigned Numbers Authority and are listed at http://www.iana.org/ Port numbers should be assigned from numbers 49152 through 65535.
Senior Engineer Jessie
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