第一次报错：
[IM002][Mircrosoft][ODBC驱动程序管理器]未发现数据源名称并且未指定默认驱动程序（0）
第二次报错：
[08001][Mircrosoft][SQL Server Native Client 10.0]Named Pipes Provider:Could not open a connection to SQL Server[53]. (53)
[HYT00][Mircrosoft][SQL Server Native Client 10.0]Login timeout expried(0)
[08001][Mircrosoft][SQL Server Native Client 10.0]A network-related or instance-specific error has occurred while establishing aconnection to SQL Server is not found or not accessible. Check if instance name iscorrect and if SQL Server is configured to allow remote connetcions. For more information see SQL Server Books Online. (53)
第三次报错：
[08001][Mircrosoft][SQL Server Native Client 10.0]SQL Server Network Interfaces:Connection string is not valid[87]. (87)
[HYT00][Mircrosoft][SQL Server Native Client 10.0]Login timeout expried(0)
[08001][Mircrosoft][SQL Server Native Client 10.0]A network-related or instance-specific error has occurred while establishing aconnection to SQL Server is not found or not accessible. Check if instance name iscorrect and if SQL Server is configured to allow remote connetcions. For more information see SQL Server Books Online. (87)
解决：
参考：https://blog.csdn.net/fragrant_no1/article/details/83345458
解决报错一，navicat 安装路径下找到 sqlncli_x64.msi 双击安装。
解决报错二，三，指定端口时，注意端口连接符不是用冒号" : "连接的，要用逗号","链接。