是否有命名实例?如果是这样，您的连接字符串是否包含实例的名称?例如``MyServer \ MyInstance''.

还要使用外围应用配置器"工具检查是否允许远程连接.

Are having a named instance? If so does your connection string contain the name of the instance? For example ''MyServer\MyInstance''.

Also check using Surface Area Configuration tool that remote connections are allowed.