Set-TrustAllCertsPolicy.ps1

<#
.SYNOPSIS
    Set CertificatePolicy to trust all certs.  This will remain in effect for this session.
.Functionality
    Web
.NOTES
    Not sure where this originated.  A few references:
        http://connect.microsoft.com/PowerShell/feedback/details/419466/new-webserviceproxy-needs-force-parameter-to-ignore-ssl-errors
        http://stackoverflow.com/questions/11696944/powershell-v3-invoke-webrequest-https-error
#>


if([System.Net.ServicePointManager]::CertificatePolicy.ToString() -eq "TrustAllCertsPolicy")
{
    Write-Verbose "Current policy is already set to TrustAllCertsPolicy"
}
else
{
    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
}