Active Directory Discovery - Current security context is not associated with an Active Directory domain or forest

Hiya,

I'm having some problems with the Active Directory discovery methods, I select the new active directory container button and whenever I click ok on that dialog box it crashes out with the following error:

System.DirectoryServices.ActiveDirectory.ActiveDirectoryOperationException: Current security context is not associated with an Active Directory domain or forest.
   at System.DirectoryServices.ActiveDirectory.DirectoryContext.GetLoggedOnDomain()
   at System.DirectoryServices.ActiveDirectory.DirectoryContext.IsContextValid(DirectoryContext context, DirectoryContextType contextType)
   at System.DirectoryServices.ActiveDirectory.DirectoryContext.isDomain()
   at System.DirectoryServices.ActiveDirectory.Domain.GetDomain(DirectoryContext context)
   at Microsoft.ConfigurationManagement.AdminConsole.ActiveDirectory.Utils.TryParseSiteServerDomain(String domainName, String& ldapPath)
   at Microsoft.ConfigurationManagement.AdminConsole.ActiveDirectory.DiscoveryPageControl.ListViewItemAdd()
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Any help would be much appreciated,

Thanks

Paul