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How to solve the connection failure of SQLServer database instance
When accessing the SQLServer database fails, the most common errors are "connecting to the server failed, SQLServer did not exist or access was denied", or "establishing a link with (local) failed, SQLServer did not exist or access was denied". As shown in the figure below.

There are many reasons for this problem. The most common mistake that novices make is not starting MSSQLSERVER service. After installing SQLServer, you should check whether the MSSQLSERVER service is started and whether it is not set to start automatically.

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