Powershell iwr fails when attempting -SkipCertificateCheck

Question

Using powershell (version 5.1.18362.145) and attempting to use Invoke-WebRequest it fails when using the -SkipCertificateCheck.

I don't know what to do about this as it seems to be documented on the msdn. I have tried running Update-Module just in case the module was an old version however that has not rectified the issue.

Command:

iwr -SkipCertificateCheck google.com -UseBasicParsing -Method Head

Error:

Invoke-WebRequest : A parameter cannot be found that matches parameter name 'SkipCertificateCheck'

At line:1 char:5
+ iwr -SkipCertificateCheck google.com -Method Head
+     ~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidArgument: (:) [Invoke-WebRequest], ParameterBindingException
    + FullyQualifiedErrorId : NamedParameterNotFound,Microsoft.PowerShell.Commands.InvokeWebRequestCommand`

Does anyone know how to get Invoke-WebRequest to work without checking certificates?

The overall goal of this is to use Invoke-WebRequest with a site that has a self signed certificate.

Answer 1

SkipCertificateCheck is not available on 5.1, you're most likely looking at the wrong version of PowerShell. This is a common workaround used for Untrusted Certificates.

add-type @"
using System.Net;
using System.Security.Cryptography.X509Certificates;
public class TrustAllCertsPolicy : ICertificatePolicy {
    public bool CheckValidationResult(
        ServicePoint srvPoint, X509Certificate certificate,
        WebRequest request, int certificateProblem) {
            return true;
        }
 }
"@
[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy
Invoke-WebRequest https://expired.badssl.com/