API: Parse html result after sensor creation and Invoke-WebRequest not working

Hi Actually this question is related to every web query giving back an html page A silly question from a dumb powersheller ;) I'm using Powershell 4.0 Here is my query:

[System.Net.ServicePointManager]::ServerCertificateValidationCallback = {$true}
$url = "https://myprtg.domain.tld/api/duplicateobject.htm?id=61222&name=9998 FIX: Uptime&targetid=63040&username=me&password=pass"

When I do:

$result = Invoke-WebRequest  $url

I have an error (since the beginning for all my functions):

Invoke-WebRequest : The underlying connection was closed: An unexpected error occurred on a send.
At line:1 char:11
+ $result = Invoke-WebRequest  $url
+           ~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-WebRequest], WebException
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand

I used to make it like this instead:

$wc = New-Object System.Net.WebClient
$url = "https://myprtg.domain.tld/api/duplicateobject.htm?id=61222&name=9998 FIX: Uptime&targetid=63040&username=me&password=pass"
$result = $wc.DownloadString($url)
$html = New-Object -ComObject "HTMLFile"
$html.IHTMLDocument2_write($result)
$html.forms | % innerhtml

This last line gives back the whole form but I can't figure out how to get the new sensor id only Do you have any suggestion? Thank you upfront

$ResultId = ($Result | where {$_ -like "*sensor*"} | Select-Object -first 1) -replace ".*sensor.htm.id=(\d+)`".*",'$1'