Connect-MsolService – Unable to authenticate your credentials

For the configuration of a Microsoft Online Tenant in the Microsoft Cloud (e.g. for Office 365) you need additional Powershell modules.
To get them, just install ‘SharePoint Online Management Shell’.
I want to introduce you Connect-MsolService and how to troubleshoot the Error “Unable to authenticate your credentials”

In this article I want to explain to you how to log on to a Micrsoft Online Tenant such as Office 365 with Connect-MsolService. And I also want to talk about a typical problem with the proxy configuration.
 

Connect-MsolService

First, download the SharePoint Online Management Shell from Microsoft
Download Link: http://www.microsoft.com/en-us/download/details.aspx?id=35588

1. Load the Powershell modules with the following command:
    
   Import-Module Microsoft.Online.SharePoint.PowerShell -force -DisableNameChecking

   1	Import-Module Microsoft.Online.SharePoint.PowerShell -force -DisableNameChecking

2. Log-on to the Microsoft Online Tenant in the Microsoft Cloud with the cmdlet ‘Connect-MsolService’
    
   $cred=Get-Credential Connect-MsolService –Credential $cred

   1 2	$cred=Get-Credential Connect-MsolService –Credential $cred

Up to this point it sounds fairly easy. However, you have to bear in mind that the Powershell with the cmdlet ‘Connect-MsolService’ wants to connect to the internet. Not considering that the server has to connect directly to the internet, I assume that the Powershell cmdlet (like other Microsoft products) uses the proxy-setting of Internet Explorer. 
 

Error: Unable to authenticate your credentials

Besides a correct proxy configuration of Internet Explorer on the server, the following error message pops up:

The solution is a proxy-configuration for the Powershell with the command netsh:  

netsh winhttp set Proxy proxy.firstattribute.com:8080