powershell基础连接已关闭：发送时发生意外错误

我是Powershell的新手，创建了一些断点来找出脚本超时的原因。但我的错误率越来越低。任何帮助都将不胜感激

使用“0”参数调用“GetRequestStream”时发生异常：“ 基础连接已关闭：服务器上发生意外错误 发送。“在C:\Users\ksingh\Documents\SQL scripts\pdfimportPowerShell.ps1:155字符：5 +$requestStream=[System.IO.Stream]$request.GetRequestStream（） + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +CategoryInfo:NotSpecified:（：）[]，MethodInvocationException +FullyQualifiedErrorId:WebException

这是脚本的一部分，错误发生在--

调用令牌服务的函数

bytes = [System.Text.Encoding]::ASCII.GetBytes($data)

function GetNewToken()
{
    $request = [Net.WebRequest]::Create($temptokenserviceurl)

    $request.ServicePoint.Expect100Continue = $false

    $request.ContentType = "application/json"

    $request.Method = "POST"

    $data = (New-Object PSObject |
        Add-Member -PassThru NoteProperty username $temptokenserviceuser |    
        Add-Member -PassThru NoteProperty password $temptokenservicepassword
    ) | ConvertTo-JSON

    $bytes = [System.Text.Encoding]::ASCII.GetBytes($data)

    $request.ContentLength = $bytes.Length

    $requestStream = [System.IO.Stream]$request.GetRequestStream()

    $requestStream.write($bytes, 0, $bytes.Length)

    $response = $request.GetResponse()

    $StreamReader = New-Object IO.StreamReader($response.getResponseStream())

    $Json = $StreamReader.ReadToEnd()

    $responseString = $Json | ConvertFrom-Json

    $response.Close()

    return $responseString.tokenId
}