[SQL] SQL ERROR [08001]

I am getting an error on SQL Server 2012. Whenever I am trying to connect with with the database, I get this error:

Cannot connect to the database.

ERROR [08001] [Microsoft][ODBC SQL Server Driver][DBNETLIB] SQL Serverdoes not exist or access denied.

ERROR [01000] [Microsoft][ODBC SQL Server Driver][DBNETLIB]ConnectionOpen (Connect()).
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The server is localhost and authorization have also done with the correct username and password but still it is the same result, I have also tried the Windows Authorization

Does anyone know any solution for this error?

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