Get-CrmSetting : The caller was not authenticated by the service.

When trying to fix my Help URL on a working IFD of Dynamics CRM 2011 UR11, I get the following error in an elevated PowerShell session:

 Get-CrmSetting : The caller was not authenticated by the service.
At line:1 char:29
+ $websetting = Get-CrmSetting <<<<  WebAddressSettings
    + CategoryInfo          : NotSpecified: (:) [Get-CrmSetting], SecurityNegotiationException
    + FullyQualifiedErrorId : System.ServiceModel.Security.SecurityNegotiationException,Microsoft.Crm.PowerShell.GetCr
   mSettingCmdlet

I am logged in as a Domain and Enterprise Admin.  Any idea as to why I can't run a simple Get?

Please advise,

Benjamin Rutledge