Reason: Server is in single user mode. Only one administrator can connect at this time

单击Start→All Programs→Microsoft SQL Server 2008→Configuration Tools→SQL Server Configuration Manager.
右键单击面板右边的SQL Server ,然后在下拉菜单中选择Properties ,在SQL Server Properties 界面上,单击Advanced 选项卡。删除“;-m”,如下图所示,保存,重启SQL Server。

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