SharePoint 2010 打包 KB2756920 出现无法访问的问题，是一个bug，要卸载掉 After Security Update KB2756920 problems in Sharepoint 2010 详细请参考 http://social.technet.microsoft.com/Forums/en-GB/sharepointadminprevious/thread/903d0e22-6419-48c5-8669-a1191c841b76