用Windows server 2008 R2 DNS添加ISA WPAD的别名老是解析失败，并且在DNS event view中看到有这样的错误：
Source：DNS,Event ID:7600
原因：
windows 2008 server R2 的DNS 有一个DNS block list 模块，默认禁止解析WPAD.
解决方法：
参考；
 
Updating the block list
Use the dnscmd command-line tool to manage the global query block list. Open a command line prompt, and then do the following:
  1. To check whether the global query block is enabled, type the following:
    dnscmd /info /enableglobalqueryblocklist
  2. To display the host names in the current block list, type the following:
    dnscmd /info /globalqueryblocklist
  3. To disable the block list and ensure that the DNS Server service does not ignore queries for names in the block list, type the following:
    dnscmd /config /enableglobalqueryblocklist 0
  4. To enable the block list and ensure that the DNS Server service ignores queries for names in the block list, type the following:
    dnscmd /config /enableglobalqueryblocklist 1
  5. To remove all names from the block list, type the following:
    dnscmd /config /globalqueryblocklist
  6. To replace the current block list with a list of the names that you specify, type the following:
    dnscmd /config /globalqueryblocklist name [name]…