When you administer the Block all stations task or the Limit web access on all stations task for Windows MultiPoint Server (WMS) 2011 stations and then close the MultiPoint Manager, a new user session on a station is not blocked or limited to specified websites.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about how to block or unblock stations, visit the following Microsoft TechNet website:
824684 Description of the standard terminology that is used to describe Microsoft software updates
Article ID: 2564508 - Last Review: Aug 8, 2011 - Revision: 1