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Error40; unable to open the connection to SQL Server, set TCP/IP and other issues that cannot be connected

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SQL server2005 failed: error40; unable to open the connection to SQL Server, set TCP/IP and other issues that cannot be connected.

TCP/IP is set to allow.

The username and password are correct.

Sqlserver2005 built-in management tools can be connected.

Server address of the connection string:. (local) localhost 127.0.0.1 IP Address

It's useless.

Then open

Configuration tool> SQL Server Configuration Manager

Find the sqlserver Network Configuration

Right-click the TCP/IP protocol and choose Properties> ipall> port 1433.

As follows:

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