Various ways of ignoring self signed certificates in Windows PowerShell 5.1

Disable-CertTrustCallback.ps1

# Copyright: (c) 2025, Jordan Borean (@jborean93) <[email protected]>
# MIT License (see LICENSE or https://opensource.org/licenses/MIT)

using namespace System.Net
using namespace System.Net.Security

Function Disable-CertificateTrust {
    [CmdletBinding()]
    param ()

    Add-Type -TypeDefinition @'
using System;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;

namespace PwshTrust
{
    public static class CertCallback
    {
        public static bool IgnoreCert(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
        {
            return true;
        }
    }
}
'@

    [ServicePointManager]::ServerCertificateValidationCallback = [Delegate]::CreateDelegate(
        [RemoteCertificateValidationCallback],
        [PwshTrust.CertCallback].GetMethod('IgnoreCert'))
}

Disable-CertTrustLinqETree.ps1

# Copyright: (c) 2025, Jordan Borean (@jborean93) <[email protected]>
# MIT License (see LICENSE or https://opensource.org/licenses/MIT)

using namespace System.Linq.Expressions
using namespace System.Net
using namespace System.Net.Security
using namespace System.Security.Cryptography.X509Certificates

Function Disable-CertificateTrust {
    [CmdletBinding()]
    param ()

    $callback = [Expression]::Lambda(
        [RemoteCertificateValidationCallback],
        [Expression]::Constant($true, [bool]),
        [Expression]::Parameter([object], "sender"),
        [Expression]::Parameter([X509Certificate], "certificate"),
        [Expression]::Parameter([X509Chain], "chain"),
        [Expression]::Parameter([SslPolicyErrors], "sslPolicyErrors")
    ).Compile()

    [ServicePointManager]::ServerCertificateValidationCallback = $callback
}