title: Azure account will timeout and I am unable to re-authenticate in Powershell
body: <p>I have written a suite of Powershell scripts that can build out my IAAS infrastructure using Azure Resource Manager.  All of these scripts are intended to run non-interactive from a continuous integration framework we use.  In the Powershell scripts, prior to calling a command like New-AzureResourceGroup, I first check to make sure machine running the script is authenticated to Azure by running Get-AzureSubscription and Get-AzureAccount.  If it finds that it is not authenticated, then it will run a series of cmdlets such as Import-AzurePublishSettingsFile, Select-AzureSubscription, Add-AzureAccount and so on.  </p>
  
  <p>This works fine most of the time, and I am able to change subscriptions and credentials each time through and the script will notice the change, and point to the correct subscription and re-authenticate as needed.  However, once the Azure account session times out (I think it takes 12 hours), none of the above will work to re-authenticate.  If I run something like New-AzureResourceGroup while it is in this state, I will receive the message "Unauthorized".  </p>
  
  <p>Once that happens, the only thing will fix it is if I manually run Add-AzureAccount, and manually type in my credentials.  Once that is done, my scripts will run fine until the next timeout.  </p>
  
  <p>I have read that importing the publish settings file alone should work for this scenario, but re-importing the file doesn't seem to work either.  Has anyone else been able to authenticate to Azure from a Powershell script after a timeout?</p>