<configuration>
 <system.webServer>
  <security>
   <requestFiltering>
    <hiddenSegments>
     <add segment="BIN"/>
    </hiddenSegments>
   </requestFiltering>
  </security>
 </system.webServer>
</configuration>

这导致http://yoursite/bin无法使用(但http://yoursite/binary仍可正常工作)

查看：
http://learn.iis.net/page.aspx/143/how-to-use-request-filtering