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無法連線到 (local)。

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在與 SQL Server 建立連線時出現與網路相關的或特定於例項的錯誤。未找到或無法訪問伺服器。請驗證例項名稱是否正確並且 SQL Server 已配置為允許遠端連線。 (provider: 命名管道提供程式, error: 40 - 無法開啟到 SQL Server 的連線) (.Net SqlClient Data Provider)

------------------------------ 有關幫助資訊，請單擊: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=2&LinkId=20476

------------------------------ 錯誤號: 2 嚴重性: 20 狀態: 0

------------------------------ 程式位置:

   在 System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)    在 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)    在 System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject, Boolean withFailover)    在 System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject, Boolean withFailover)    在 System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart)    在 System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance)    在 System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance)    在 System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection)    在 System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup)    在 System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)    在 System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)    在 System.Data.SqlClient.SqlConnection.Open()    在 Microsoft.SqlServer.Management.SqlStudio.Explorer.ObjectExplorerService.ValidateConnection(UIConnectionInfo ci, IServerType server)    在 Microsoft.SqlServer.Management.UI.ConnectionDlg.Connector.ConnectionThreadUser()