Using Invoke-WebRequest in Powershell to authenticate against Forms authentication in a C# MVC site

I am using Invoke-WebRequest in Powershell to authenticate against Forms authentication in a C# MVC site.

I have usually done it this way successfully;
$webServerUrl = 'http://localhost:54363'

$r = Invoke-WebRequest $webServerUrl -SessionVariable my_session
$form = $r.Forms[0]
$credentials = Get-Credential
$form.fields['Username'] = $credentials.GetNetworkCredential().UserName
$form.fields['Password'] = $credentials.GetNetworkCredential().Password
$form.fields['RembemberMe'] = $true;

$r = Invoke-WebRequest -Uri $($webServerUrl + $form.Action) -WebSession $my_session -Method GET -Body $form.Fields

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As you can see, I retrieve a form, set username and password and log in.
But now in the recent version of the system, the first Invoke-WebRequest fails and the $r variable is never populated.

I get the html of the page outputted to the Powershell terminal window and at the end of that I receive:
+ $r = Invoke-WebRequest $webServerUrl -SessionVariable my_session
+      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-WebRequest], WebExc
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand

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I have tried debugging the MVC application while sending a request with Powershell, and I cannot see anything out of the ordinary. The LoginController and its Index method returns 401 Not Authorized with the HTML for a login form. When I use that form in a web browser, I can log in. But my attempt  in Powershell still fails.

The error variable displays this:
The remote server returned an error: (401) Unauthorized.

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Jose Gabriel Ortega CastroEE Solution Guide - CEO Faru Bonon ITCommented:
Try to do the job "in the front end" first,
Try this script, it worked for me.
just download it, modify the parameters according to what you need.

Run it.

And once it's working...
Save the script part in a "scriptblock"
#Script here
And run the
Invoke-Command -scriptblock $sb -computer "computer"
itniflAuthor Commented:
Trying to do the job on the computer itself via remote script execution might be a good idea for simplicity, but in this case I end up calling the web site anyway. Doesn't matter what computer I am doing it from.

Usually a user enters a username and password in a web page, which works fine. Normally the script execution with Powershell I referred to allows me to do this with Powershell.

But not any more. I guess I have to find out when this broke, and then figure out what changes have been made to the system in the mean time,,,
Jose Gabriel Ortega CastroEE Solution Guide - CEO Faru Bonon ITCommented:
itniflAuthor Commented:
Finally figured it out.
There was a nested partial view in the MVC solution with the Authorize attribute set. So when entering the login form, the user got a reply 401 Unauthorized, while he was supposed to get 200 OK.

The web browser handeled this fine, while  Invoke-WebRequest threw an error.

Removing the authorize attribute from the nested partial view that was being called solved the problem.

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itniflAuthor Commented:
Solution was found
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