SharePoint 2010中的访问被拒绝

Question

有些用户在查看sharepoint日志时会收到以下访问被拒绝错误。这些用户之前能够访问SharePoint网站。但突然之间他们得到了“出现了意外错误”。

PermissionMask check failed. asking for 0x00000005, have 0x400000300C231061  
PermissionMask check failed. asking for 0x00000015, have 0x400000300C231061  
PermissionMask check failed. asking for 0x00040000, have 0x400000B00C631061  
PermissionMask check failed. asking for 0x00040000, have 0x400000B00C631061  
PermissionMask check failed. asking for 0x20000000, have 0x400000B00C631061  
PermissionMask check failed. asking for 0x30000000, have 0x400000B00C631061  

服务器上没有任何变化，他们拥有与之前相同的权限。