Powershell Invoke-RestMethod over HTTPS

Question

I'm trying to communicate with a service over powershell but I am failing miserably. I suspect it is the certificate and I have googled for the answer and found two options, none of which worked for me. I have also tried to combine the two unsuccessfully.

Option 1:

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

$urlJSON = "https://internal.ad.local/path/api_jsonrpc.php"

#Create authentication JSON object using ConvertTo-JSON
$objAuth = (New-Object PSObject | Add-Member -PassThru NoteProperty jsonrpc '2.0' |
Add-Member -PassThru NoteProperty method 'user.authenticate' |
Add-Member -PassThru NoteProperty params @{user="user";password="password"} |
Add-Member -PassThru NoteProperty id '2') | ConvertTo-Json


Invoke-RestMethod -Uri $urlJSON -body $objAuth -method "Post"

Option 2:

[System.Net.ServicePointManager]::ServerCertificateValidationCallback = {$true}

$urlJSON = "https://internal.ad.local/path/api_jsonrpc.php"

#Create authentication JSON object using ConvertTo-JSON
$objAuth = (New-Object PSObject | Add-Member -PassThru NoteProperty jsonrpc '2.0' |
Add-Member -PassThru NoteProperty method 'user.authenticate' |
Add-Member -PassThru NoteProperty params @{user="user";password="password"} |
Add-Member -PassThru NoteProperty id '2') | ConvertTo-Json


Invoke-RestMethod -Uri $urlJSON -body $objAuth -method "Post"

Here's the error message:

Invoke-RestMethod : The underlying connection was closed: An unexpected error occurred on a send.
At C:\Users\user\AppData\Local\Temp\46eaa6f7-62a0-4c10-88d1-79212d652bc9.ps1:24 char:1
+ Invoke-RestMethod -Uri $urlJSON -body $objAuth -method "Post"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-RestMethod], WebException
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand

I might add:

• surfing directly to the service works with a web browser
• I tried opening up to HTTP as well, and that worked
• The certificate used by the service is self-signed but trusted by my machine via a root certficate (no warnings is issues in IE or Chrome)
• I have done network captures and made sure that a packets does indeed reach the server.

Any suggestions appreciated!

Kind regards, Patrik

Updated post as to suggestions made by Mr Tree below:

Name                       : lambda_method
DeclaringType              :
ReflectedType              :
Module                     : RefEmit_InMemoryManifestModule
MethodHandle               :
Attributes                 : PrivateScope, Public, Static
CallingConvention          : Standard
IsSecurityCritical         : False
IsSecuritySafeCritical     : False
IsSecurityTransparent      : True
ReturnType                 : System.Boolean
ReturnParameter            :
ReturnTypeCustomAttributes : System.Reflection.Emit.DynamicMethod+RTDynamicMethod+EmptyCAHolder
MemberType                 : Method
MethodImplementationFlags  : NoInlining
IsGenericMethodDefinition  : False
ContainsGenericParameters  : False
IsGenericMethod            : False
IsPublic                   : True
IsPrivate                  : False
IsFamily                   : False
IsAssembly                 : False
IsFamilyAndAssembly        : False
IsFamilyOrAssembly         : False
IsStatic                   : True
IsFinal                    : False
IsVirtual                  : False
IsHideBySig                : False
IsAbstract                 : False
IsSpecialName              : False
IsConstructor              : False
CustomAttributes           :
MetadataToken              :

Update 2 based on a comment by Mr Tree:

Invoke-RestMethod : The underlying connection was closed: An unexpected error occurred on a send.
At C:\Users\user\AppData\Local\Temp\ff47910e-fd8e-4be8-9241-99322144976a.ps1:13 char:1
+ Invoke-RestMethod -Uri $urlJSON -body $objAuth -method "Post"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-RestMethod], WebException
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand

Answer 1

I solved the mystery while troubleshooting another thing. The web server in question only supported TLS1.1 and TLS1.2. Powershell does NOT seem to support that. If I enabled TLS1.0 it worked.

To force TLS1.2 you can use this line:

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

Hope that helps someone else and thanks for all helpful comments!

/Patrik