通过SqlPowershell使用SQL身份验证连接到远程SQL Server实例？

Question

我尝试使用SqlPowershell / SqlPS（Import-Module sqlps）连接到本地网络上的服务器。我按照说明here创建了一个预定义服务器/数据库和登录的函数，并每次提示输入密码：

function sqldrive
{
    param( [string]$name, [string]$login = "<myLogin>", [string]$root = "SQLSERVER:\SQL\<serverName>\<databaseName>" )
    $pwd = read-host -AsSecureString -Prompt "Password"
    $cred = new-object System.Management.Automation.PSCredential -argumentlist $login,$pwd
    New-PSDrive $name -PSProvider SqlServer -Root $root -Credential $cred -Scope 1
}

但是，在运行sqldrive <someName>并输入我的密码后，它无法连接，提供两条消息：

WARNING: Could not obtain SQL Server Service information. An attempt to connect to WMI on '<serverName>' failed with
the following error: The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)

和

New-PSDrive : SQL Server PowerShell provider error: Path SQLSERVER:\SQL\<serverName>\<databaseName> does not exist. Please
specify a valid path.
At line:6 char:5
+     New-PSDrive $name -PSProvider SqlServer -Root $root -Credential $ ...
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (SQLSERVER:\SQL\<serverName>\<databaseName>:String) [New-PSDrive], GenericProviderException
    + FullyQualifiedErrorId : PathDoesNotExist,Microsoft.PowerShell.Commands.NewPSDriveCommand

有人能发现我出错的地方吗？我可以通过SSMS使用这些凭据来使用同一台服务器。